configure: Fix __builtin_mul_overflow() compiler support check

`UINT64_C(UINT64_MAX)' is redundant and leads to a compilation error since UINT64_C involves token concatenation, causing the check to fail.

This change fixes that by using UINT64_MAX directly, and including the appropriate header.

Signed-off-by: Arjun Shankar arjun@redhat.com

Closes #4043 (closed)