Update mingw-w64 to the latest version

This fixes interlocked intrinsics for arm and arm64, and fixes
the copysignl function for x86_64.

build-mingw-w64.sh

@@ -21,7 +21,7 @@ cd mingw-w64
 
 if [ -n "$SYNC" ] || [ -n "$CHECKOUT" ]; then
     [ -z "$SYNC" ] || git fetch
-    git checkout 43a3c0bdb1f9e31db1d096d67aed0d575b6e2093
+    git checkout 95d6af0653895f962d797b3181b84b44340e6ef9
 fi
 
 cd mingw-w64-headers