Fix cmakelists not disabling unused but set variable on C

CMakeLists.txt

@@ -372,7 +372,6 @@ endmacro(ADD_C_COMPILER_FLAG_IF_AVAILABLE)
 if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-comment -Wno-reorder -Wno-unused-variable -Wtype-limits -std=c++11 -fno-strict-aliasing")
 
-  ADD_C_COMPILER_FLAG_IF_AVAILABLE("-Wno-unused-but-set-variable" HAVE_WNO_UNUSED_BUT_SET_VARIABLE)
   ADD_CXX_COMPILER_FLAG_IF_AVAILABLE("-Wno-unused-but-set-variable" HAVE_WNO_UNUSED_BUT_SET_VARIABLE)
 
   if (AUTO_DETECT_ISA)
@@ -412,6 +411,7 @@ ADD_C_COMPILER_FLAG_IF_AVAILABLE("-Werror=incompatible-pointer-types" HAVE_ERROR
 if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wno-comment -Wno-write-strings -Wno-unused-result -Wformat -Wmissing-field-initializers -Wtype-limits -std=c99 -fno-strict-aliasing -D_GNU_SOURCE")
 
+  ADD_C_COMPILER_FLAG_IF_AVAILABLE("-Wno-unused-but-set-variable" HAVE_WNO_UNUSED_BUT_SET_VARIABLE)
   if(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -ggdb -O0 -DDEBUG_MODE -DBUILD_TYPE_DEBUG")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ggdb -O0 -DDEBUG_MODE -DBUILD_TYPE_DEBUG")