remove knetbsd support

remove knetbsd support

gcc/ChangeLog:

2016-06-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* config.gcc: Remove support for knetbsd.
	* configure.ac: Likewise.
	* config/i386/knetbsd-gnu.h: Remove.  * config/i386/knetbsd-gnu64.h: Remove.
	* config/knetbsd-gnu.h: Remove.
	* configure: Regenerate.

libgcc/ChangeLog:

2016-06-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* config.host: Remove support for knetbsd.

libstdc++-v3/ChangeLog:

2016-06-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* configure: Regenerate.
	* configure.host: Remove support for knetbsd.
	* crossconfig.m4: Likewise.

contrib/ChangeLog:

2016-06-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* config-list.mk: stop testing knetbsd.

From-SVN: r237662