Handle overflow in __hcreate_r

Hi,

As in bugzilla entry there is overflow in hsearch when looking for prime
number as SIZE_MAX - 1 is divisible by 5. We fix that by rejecting large
inputs before looking for prime.

	* misc/hsearch_r.c (__hcreate_r): Handle overflow.

(cherry picked from commit 2f5c1750)
(cherry picked from commit 51e76257)