new cmake doesn't consider CLang == GNUCC, set flags for clang explicitly.

CMakeLists.txt

@@ -499,6 +499,9 @@ if(UNIX AND NOT APPLE)
 	# GNU Compiler
 	if(CMAKE_COMPILER_IS_GNUCC)
 		set(PLATFORM_CFLAGS "-pipe -fPIC -funsigned-char -fno-strict-aliasing")
+	# CLang is the same as GCC for now.
+	elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+		set(PLATFORM_CFLAGS "-pipe -fPIC -funsigned-char -fno-strict-aliasing")
 	# Intel C++ Compiler
 	elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
 		# think these next two are broken