[PATCH] Change AC_COMPILE_IFELSE into AC_LINK_IFELSE for the __sync_{add, sub}_and_fetch() test

[Jason Evans]

On Mar 27, 2012, at 6:03 AM, Mike Hommey wrote:
> With the Android NDK, __sync_{add,sub}_and_fetch() compile fine for uint64_t,
> but the corresponding libgcc function aren't there.

Applied; thanks.

Jason