headers: Skip defining __cpuidex for Clang 17

Just like GCC 11 got this function, Clang 17 also got an implementation
of it - thus skip our version to avoid conflicts.

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-headers/include/psdk_inc/intrin-impl.h

@@ -2023,7 +2023,7 @@ void __cpuid(int CPUInfo[4], int InfoType) {
 #define __INTRINSIC_DEFINED___cpuid
 #endif /* __INTRINSIC_PROLOG */
 
-#if (!defined(__GNUC__) || __GNUC__ < 11)
+#if (!defined(__GNUC__) || __GNUC__ < 11) && (!defined(__clang__) || __clang_major__ < 17)
 #if __INTRINSIC_PROLOG(__cpuidex)
 void __cpuidex(int CPUInfo[4], int, int);
 #if !__has_builtin(__cpuidex)