Update top level configure files by synchronizing them with gcc.

Update top level configure files by synchronizing them with gcc.

.	* config-ml.in: Sync with gcc sources.
	* config.guess: Likewise.
	* config.sub: Likewise.
	* configure.ac: Likewise.
	* configure: Regenerate.

config	* Sync with GCC sources:

	2017-11-14 Boris Kolpackov  <[email protected]>

	* gcc-plugin.m4: Add support for MinGW.

	2017-11-17  Igor Tsimbalist  <[email protected]>

	* cet.m4: New file.

	2017-11-15  Alexandre Oliva <[email protected]>

	* bootstrap-debug-lean.mk (do-compare): Use the
	contrib/compare-debug script.

	2017-10-24  H.J. Lu  <[email protected]>

	* bootstrap-cet.mk: New file.

	2017-06-19  Martin Liska  <[email protected]>

	* bootstrap-lto-noplugin.mk: Enable -flto in all PGO stages.
	* bootstrap-lto.mk: Likewise.

	2017-06-03  Eric Botcazou  <[email protected]>

	* mt-android: New file.

	2017-02-13  Richard Biener  <[email protected]>

	* isl.m4: Remove support for ISL 0.14.

	2017-01-19  Uros Bizjak  <[email protected]>

	PR target/78478
	* ax_check_define.m4: New file.

	2017-01-17  Jakub Jelinek  <[email protected]>

	PR other/79046
	* acx.m4 (GCC_BASE_VER): New m4 function.
	(ACX_TOOL_DIRS): Require GCC_BASE_VER, for
	--with-gcc-major-version-only use just major number from BASE-VER.

	2017-01-06  Rainer Orth  <[email protected]>

	PR go/78978
	* hwcaps.m4 (GCC_CHECK_ASSEMBLER_HWCAP): New macro.