[binutils-gdb] Revert the AM_ZLIB change in bfd

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 9ae46699504c63af285d40ad8856a29300d318e4 ***

Author: H.J. Lu <hjl.tools@gmail.com>
Branch: master
Commit: 9ae46699504c63af285d40ad8856a29300d318e4

Revert the AM_ZLIB change in bfd
	* configure.ac: Revert the AM_ZLIB change.
	* Makefile.in: Regenerated.
	* aclocal.m4: Likewise.
	* configure: Likewise.
	* doc/Makefile.in: Likewise.