[binutils-gdb] Remove unnecessary set_gdbarch_gnu_triplet_regexp calls

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT e9bb3fbbe81115b196b436cf513f0fd7b41d6a4a ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: e9bb3fbbe81115b196b436cf513f0fd7b41d6a4a

Remove unnecessary set_gdbarch_gnu_triplet_regexp calls

i386_gdbarch_init already does this unconditionally for all x86 ports.

Tested on x86-64 Fedora 23.

gdb/ChangeLog:
2017-04-12  Pedro Alves  <palves@redhat.com>

	* i386-tdep.c (i386_elf_init_abi, i386_go32_init_abi): Remove
	calls to set_gdbarch_gnu_triplet_regexp.