re PR libgomp/83106 (libgomp/target.c:2671:2: error: ‘strncat’ specified bound 5 equals source length [-Werror=stringop-overflow=])

	PR libgomp/83106
	* target.c (gomp_target_init): Compute lengths just once and
	use them in both malloc size and subsequent copying.

From-SVN: r255080