Use _() in calls to build_help

Currently some code in gdb uses build_help with N_(), like:

  static const std::string compile_print_help
    = gdb::option::build_help (N_("\

I believe this is incorrect.  The N_ macro is used to mark text that
should end up in the message catalog, but which will be translated by
a later call to gettext.

However, in this case, there is no later call to gettext, so (if gdb
had translations), this text would remain untranslated.

Instead, I think using the ordinary _() macro is correct here.
Translators will have to know to preserve "%OPTIONS%" in the text --
but that seems both unavoidable and fine.

Tested by rebuilding as there's not much else to do.

gdb/ChangeLog
2019-08-05  Tom Tromey  <tromey@adacore.com>

	* compile/compile.c (_initialize_compile): Use _(), not N_().
	* thread.c (_initialize_thread): Use _(), not N_().
	* stack.c (_initialize_stack): Use _(), not N_().
	* printcmd.c (_initialize_printcmd): Use _(), not N_().

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2019-08-05  Tom Tromey  <tromey@adacore.com>
+
+	* compile/compile.c (_initialize_compile): Use _(), not N_().
+	* thread.c (_initialize_thread): Use _(), not N_().
+	* stack.c (_initialize_stack): Use _(), not N_().
+	* printcmd.c (_initialize_printcmd): Use _(), not N_().
+
 2019-08-04  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* dwarf2read.c (struct dw2_symtab_iterator):

gdb/compile/compile.c

@@ -971,7 +971,7 @@ Command to compile source code and inject it into the inferior."),
   const auto compile_opts = make_compile_options_def_group (nullptr);
 
   static const std::string compile_code_help
-    = gdb::option::build_help (N_("\
+    = gdb::option::build_help (_("\
 Compile, inject, and execute code.\n\
 \n\
 Usage: compile code [OPTION]... [CODE]\n\
@@ -994,7 +994,7 @@ indicate the end of the expression."),
   set_cmd_completer_handle_brkchars (c, compile_code_command_completer);
 
 static const std::string compile_file_help
-    = gdb::option::build_help (N_("\
+    = gdb::option::build_help (_("\
 Evaluate a file containing source code.\n\
 \n\
 Usage: compile file [OPTION].. [FILENAME]\n\
@@ -1011,7 +1011,7 @@ Options:\n\
   const auto compile_print_opts = make_value_print_options_def_group (nullptr);
 
   static const std::string compile_print_help
-    = gdb::option::build_help (N_("\
+    = gdb::option::build_help (_("\
 Evaluate EXPR by using the compiler and print result.\n\
 \n\
 Usage: compile print [[OPTION]... --] [/FMT] [EXPR]\n\

gdb/printcmd.c

@@ -2848,7 +2848,7 @@ This may usually be abbreviated to simply \"set\"."),
 
   const auto print_opts = make_value_print_options_def_group (nullptr);
 
-  static const std::string print_help = gdb::option::build_help (N_("\
+  static const std::string print_help = gdb::option::build_help (_("\
 Print value of expression EXP.\n\
 Usage: print [[OPTION]... --] [/FMT] [EXP]\n\
 \n\

gdb/stack.c

@@ -3275,7 +3275,7 @@ Options:\n\
   const auto frame_apply_opts
     = make_frame_apply_options_def_group (nullptr, nullptr);
 
-  static std::string frame_apply_cmd_help = gdb::option::build_help (N_("\
+  static std::string frame_apply_cmd_help = gdb::option::build_help (_("\
 Apply a command to a number of frames.\n\
 Usage: frame apply COUNT [OPTION]... COMMAND\n\
 With a negative COUNT argument, applies the command on outermost -COUNT frames.\n"
@@ -3288,7 +3288,7 @@ With a negative COUNT argument, applies the command on outermost -COUNT frames.\
 			&frame_cmd_list);
   set_cmd_completer_handle_brkchars (cmd, frame_apply_cmd_completer);
 
-  static std::string frame_apply_all_cmd_help = gdb::option::build_help (N_("\
+  static std::string frame_apply_all_cmd_help = gdb::option::build_help (_("\
 Apply a command to all frames.\n\
 \n\
 Usage: frame apply all [OPTION]... COMMAND\n"
@@ -3300,7 +3300,7 @@ Usage: frame apply all [OPTION]... COMMAND\n"
 		 &frame_apply_cmd_list);
   set_cmd_completer_handle_brkchars (cmd, frame_apply_all_cmd_completer);
 
-  static std::string frame_apply_level_cmd_help = gdb::option::build_help (N_("\
+  static std::string frame_apply_level_cmd_help = gdb::option::build_help (_("\
 Apply a command to a list of frames.\n\
 \n\
 Usage: frame apply level LEVEL... [OPTION]... COMMAND\n\
@@ -3407,7 +3407,7 @@ Usage: select-frame level LEVEL"),
     = make_backtrace_options_def_group (nullptr, nullptr, nullptr);
 
   static std::string backtrace_help
-    = gdb::option::build_help (N_("\
+    = gdb::option::build_help (_("\
 Print backtrace of all stack frames, or innermost COUNT frames.\n\
 Usage: backtrace [OPTION]... [QUALIFIER]... [COUNT | -COUNT]\n\
 \n\

gdb/thread.c

@@ -2150,7 +2150,7 @@ Options:\n\
 
   const auto thread_apply_opts = make_thread_apply_options_def_group (nullptr);
 
-  static std::string thread_apply_help = gdb::option::build_help (N_("\
+  static std::string thread_apply_help = gdb::option::build_help (_("\
 Apply a command to a list of threads.\n\
 Usage: thread apply ID... [OPTION]... COMMAND\n\
 ID is a space-separated list of IDs of threads to apply COMMAND on.\n"
@@ -2166,7 +2166,7 @@ THREAD_APPLY_OPTION_HELP),
   const auto thread_apply_all_opts
     = make_thread_apply_all_options_def_group (nullptr, nullptr);
 
-  static std::string thread_apply_all_help = gdb::option::build_help (N_("\
+  static std::string thread_apply_all_help = gdb::option::build_help (_("\
 Apply a command to all threads.\n\
 \n\
 Usage: thread apply all [OPTION]... COMMAND\n"