[binutils-gdb] nat_extra_makefile_frag -> nat_makefile_frag

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 2b351b19efc8dd36ac8a8bda005c7411536b93ec ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: 2b351b19efc8dd36ac8a8bda005c7411536b93ec

nat_extra_makefile_frag -> nat_makefile_frag

gdb/ChangeLog:
2017-05-17  Pedro Alves  <palves@redhat.com>

	* Makefile.in (nat_extra_makefile_frag): Rename to ...
	(nat_makefile_frag): ... this.  All references updated.
	* configure.ac: Likewise.
	* configure.nat: Likewise.  Enhance comments.
	* configure: Regenerate.