Do not set -Wno-used

Author: snape

CMakeLists.txt

@@ -239,8 +239,6 @@ else()
     AVO_COMPILER_SUPPORTS_WFORMAT_SECURITY)
   check_cxx_compiler_flag(-Werror=format-security
     AVO_COMPILER_SUPPORTS_WERROR_FORMAT_SECURITY)
-  check_cxx_compiler_flag(-Wno-unused
-    AVO_COMPILER_SUPPORTS_WNO_UNUSED)
 
   if(AVO_COMPILER_SUPPORTS_WALL)
     add_compile_options(-Wall)
@@ -251,9 +249,6 @@ else()
   if(AVO_COMPILER_SUPPORTS_WERROR_FORMAT_SECURITY)
     add_compile_options(-Werror=format-security)
   endif()
-  if(AVO_COMPILER_SUPPORTS_WNO_UNUSED)
-    add_compile_options(-Wno-unused)
-  endif()
 endif()
 
 if(NOT MSVC)