Drop -Wabi useless flag (#9676)

Author: nerzhul

src/CMakeLists.txt

@@ -6,7 +6,7 @@ INCLUDE(CheckIncludeFiles)
 INCLUDE(CheckLibraryExists)
 
 # Add custom SemiDebug build mode
-set(CMAKE_CXX_FLAGS_SEMIDEBUG "-O1 -g -Wall -Wabi" CACHE STRING
+set(CMAKE_CXX_FLAGS_SEMIDEBUG "-O1 -g -Wall" CACHE STRING
 	"Flags used by the C++ compiler during semidebug builds."
 	FORCE
 )
@@ -731,8 +731,8 @@ else()
 			set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${MATH_FLAGS}")
 		endif()
 	endif(CMAKE_SYSTEM_NAME MATCHES "(Darwin|BSD|DragonFly)")
-	set(CMAKE_CXX_FLAGS_SEMIDEBUG "-g -O1 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")
-	set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")
+	set(CMAKE_CXX_FLAGS_SEMIDEBUG "-g -O1 -Wall ${WARNING_FLAGS} ${OTHER_FLAGS}")
+	set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall ${WARNING_FLAGS} ${OTHER_FLAGS}")
 
 	if(USE_GPROF)
 		set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -pg")