CMake: remove unneeded warning flag

Author: Fytch

CMakeLists.txt

@@ -26,7 +26,7 @@ if(PROGRAMOPTIONS_NOT_SUBPROJECT)
 	endif()
 
 	if(PROGRAMOPTIONS_GNU_OPTIONS)
-		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wpedantic -Wno-deprecated -fno-rtti")
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wpedantic -fno-rtti")
 		set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g -ggdb -fno-omit-frame-pointer")
 		set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -march=native -DNDEBUG -s -flto")
 	endif()