Update some copyright years.

Update some copyright years.

Some files managed to get in the tree with outdated copyright years.
This fixes it.  Applied.

gdb/
2013-02-12  Pedro Alves  <palves@redhat.com>

	* break-catch-sig.c: Update copyright years.

gdb/testsuite/
2013-02-12  Pedro Alves  <palves@redhat.com>

	* gdb.base/catch-signal.c: Update copyright years.
	* gdb.base/catch-signal.exp: Update copyright years.
	* gdb.dwarf2/dw2-dir-file-name.c: Update copyright years.
	* gdb.dwarf2/dw2-dir-file-name.exp: Update copyright years.
	* gdb.dwarf2/dw2-empty-pc-range.S: Update copyright years.
	* gdb.dwarf2/dw2-error.S: Update copyright years.
	* gdb.dwarf2/dw2-error.c: Update copyright years.
	* gdb.dwarf2/dw2-restrict.S: Update copyright years.
	* gdb.dwarf2/dw2-restrict.c: Update copyright years.
	* gdb.dwarf2/dw2-restrict.exp: Update copyright years.