Disable error on -unused-local-typedef for clang since it has false positives

Author: TheMarex

CMakeLists.txt

@@ -321,7 +321,7 @@ endif()
 # Configuring compilers
 set(OSRM_WARNING_FLAGS "-Werror=all -Werror=extra  -Werror=uninitialized -Werror=unreachable-code -Werror=unused-variable -Werror=unreachable-code -Wno-error=cpp -Wpedantic")
 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OSRM_WARNING_FLAGS} -Werror=strict-overflow=2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fPIC -fcolor-diagnostics -ftemplate-depth=1024 -Wno-unused-command-line-argument")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OSRM_WARNING_FLAGS} -Werror=strict-overflow=2 -Wno-error=unused-local-typedef -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fPIC -fcolor-diagnostics -ftemplate-depth=1024 -Wno-unused-command-line-argument")
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
   set(COLOR_FLAG "-fdiagnostics-color=auto")
   check_cxx_compiler_flag("-fdiagnostics-color=auto" HAS_COLOR_FLAG)