rl78: drop .bss override

It doesn't look to be a good idea to override the custom handler that
ELF has; afaict doing so broke .previous.

gas/config/tc-rl78.c

@@ -374,16 +374,6 @@ md_show_usage (FILE * stream)
   fprintf (stream, _("  --m64bit-doubles  Source code uses 64-bit doubles\n"));
 }
 
-static void
-s_bss (int ignore ATTRIBUTE_UNUSED)
-{
-  int temp;
-
-  temp = get_absolute_expression ();
-  subseg_set (bss_section, (subsegT) temp);
-  demand_empty_rest_of_line ();
-}
-
 static void
 rl78_float_cons (int ignore ATTRIBUTE_UNUSED)
 {
@@ -397,7 +387,6 @@ const pseudo_typeS md_pseudo_table[] =
 {
   /* Our "standard" pseudos.  */
   { "double", rl78_float_cons,	'd' },
-  { "bss",    s_bss, 		0 },
   { "3byte",  cons,		3 },
   { "int",    cons,		4 },
   { "word",   cons,		4 },