[PATCH 1/2] (header usage fix) remove unused system header includes

[PATCH 1/2] (header usage fix) remove unused system header includes

cherry picked from trunk r235361

2016-04-22  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* auto-profile.c: Remove <string.h> include.
	* ipa-icf-gimple.c: Remove <list> include.
	* diagnostic.c: Remove <new> include.
	* genmatch.c: Likewise.
	* pretty-print.c: Likewise.
	* toplev.c: Likewise
	* c/c-objc-common.c: Likewise.
	* cp/error.c: Likewise.
	* fortran/error.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-6-branch@235363 138bc75d-0d04-0410-961f-82ee72b054a4