gentoo-overlay/app-emulation/vkd3d/files/vkd3d-1.9-implicit-gettid.patch

Dirty quick fix for implicit function check, VKD3D_CHECK_FUNC ideally
needs to be adjusted to be able to pass headers.
--- a/configure
+++ b/configure
@@ -18656,2 +18656,3 @@
 /* end confdefs.h.  */
+#include <unistd.h>
 int main(void) { return gettid(); }