[binutils-gdb] Revert bfd part of "Silence gcc-8 warnings"

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT b9f26d2e29bb56a0404216c5612d6d7fee54a769 ***

Author: Alan Modra <amodra@gmail.com>
Branch: master
Commit: b9f26d2e29bb56a0404216c5612d6d7fee54a769

Revert bfd part of "Silence gcc-8 warnings"

The gcc warning has been fixed, and the patch regressed builds with
some older versions of gcc.

	* elf-linux-core.h: Revert last change.
	* elf.c: Likewise.