[PATCH 1/2] configure: Build with -mcx16 on x86_64.

[Jacek Caban]

This is needed on clang msvc target to allow _InterlockedCompareExchange128.

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---
  configure.ac | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)