Squashed 'external/xbyak/' content from commit 431abd86

git-subtree-dir: external/xbyak
git-subtree-split: 431abd865e70a46d56f5aa0e1f87572decb60169

test/detect_x32.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main()
+{
+#if defined(__x86_64__) && defined(__ILP32__)
+	puts("x32");
+#endif
+}