* ada-exp.y: Update license to GPLv3.
	* ada-lex.l: Update license to GPLv3.
	* c-exp.y: Update license to GPLv3.
	* cp-name-parser.y: Update license to GPLv3.
	* darwin-nat-info.c: Update license to GPLv3.
	* f-exp.y: Update license to GPLv3.
	* gdb_thread_db.h: Update license to GPLv3.
	* hppanbsd-nat.c: Update license to GPLv3.
	* hppanbsd-tdep.c: Update license to GPLv3.
	* hppaobsd-tdep.c: Update license to GPLv3.
	* jv-exp.y: Update license to GPLv3.
	* m2-exp.y: Update license to GPLv3.
	* objc-exp.y: Update license to GPLv3.
	* p-exp.y: Update license to GPLv3.
	* reply_mig_hack.awk: Update license to GPLv3.
	* reverse.c: Update license to GPLv3.
	* xtensa-xtregs.c: Update license to GPLv3.