[binutils-gdb] config: Sync with GCC

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 552d4da4178cc5e8d567ee150462a28d51f08fc0 ***

Author: H.J. Lu <hjl.tools@gmail.com>
Branch: master
Commit: 552d4da4178cc5e8d567ee150462a28d51f08fc0

config: Sync with GCC

	Sync with GCC
	2018-04-05  H.J. Lu  <hongjiu.lu@intel.com>

	PR gas/22318
	* plugins.m4 (AC_PLUGINS): Use dlsym to check if libdl is needed.

	2018-02-14  Igor Tsimbalist  <igor.v.tsimbalist@intel.com>

	PR target/84148
	* cet.m4: Check if target support multi-byte NOPS (SSE).