Fix preprocessor error.

##__VA_ARGS__ causes an error with clang if it's not preceded by a comma. The ## is
wholly unnecessary in this case so it can just be removed.

Bug b/73656151

Change-Id: Icc8a67a91b270d0e9b006cae7a438cdefa412f87
Reviewed-on: https://swiftshader-review.googlesource.com/21208
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Corentin Wallez <cwallez@google.com>
diff --git a/src/Common/Debug.hpp b/src/Common/Debug.hpp
index 5033bc5..9758c3b 100644
--- a/src/Common/Debug.hpp
+++ b/src/Common/Debug.hpp
@@ -40,7 +40,7 @@
 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
 	#define UNIMPLEMENTED(...) do { \
 		sw::trace("\t! Unimplemented: %s(%d): ", __FUNCTION__, __LINE__); \
-		sw::trace(##__VA_ARGS__); \
+		sw::trace(__VA_ARGS__); \
 		sw::trace("\n"); \
 		ASSERT(false); \
 	} while(0)