Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
* symfile.c (separate_debug_file_exists): When the CRCs mismatch
print a warning.
(find_separate_debug_file): Pass in the objfile's name.
gdb/testsuite/
* gdb.base/sepdebug.exp (CRC mismatch is reported): New test.
* gdb.base/sepdebug2.c: New file.