util/u_atomic: Ignore warnings interlocked accesses.

These are due how we implemented the atomic tests, not the atomic
implementation itself.  It's also difficult to refactor the code to
avoid the warnings due to the use of macros -- the code would be quite
hairy.

Reviewed-by: Brian Paul <brianp@vmware.com>

src/util/u_atomic_test.c

@@ -36,6 +36,11 @@
 
 #include "u_atomic.h"
 
+#ifdef _MSC_VER
+#pragma warning( disable : 28112 ) /* Accessing a local variable via an Interlocked function */
+#pragma warning( disable : 28113 ) /* A variable which is accessed via an Interlocked function must always be accessed via an Interlocked function */
+#endif
+
 
 /* Test only assignment-like operations, which are supported on all types */
 #define test_atomic_assign(type, ones) \