make NDEBUG version of UNIMPLEMENTED() macro variadic too

Change-Id: Ib5e2ec3c443955aefe8b001b926469b9ce5accff
Reviewed-on: https://swiftshader-review.googlesource.com/c/23828
Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
diff --git a/src/Vulkan/VkDebug.hpp b/src/Vulkan/VkDebug.hpp
index eca0744..4432df2 100644
--- a/src/Vulkan/VkDebug.hpp
+++ b/src/Vulkan/VkDebug.hpp
@@ -74,7 +74,7 @@
 	assert(false); \
 	} while(0)
 #else
-	#define UNIMPLEMENTED() FIXME("\t! Unimplemented: %s(%d)\n", __FUNCTION__, __LINE__)
+	#define UNIMPLEMENTED(...) FIXME("\t! Unimplemented: %s(%d)\n", __FUNCTION__, __LINE__)
 #endif
 
 // A macro for code which is not expected to be reached under valid assumptions