OVERRIDE_CXX_FLAGS works with MVSC too now (#1078)

Build/CMakeLists.txt

@@ -125,9 +125,11 @@ if (MSVC)
 	endif()
 
 	# Set compiler flags for various configurations
-	set(CMAKE_CXX_FLAGS_DEBUG "/GS /Od /Ob0 /RTC1")
-	set(CMAKE_CXX_FLAGS_RELEASE "/GS- /Gy /O2 /Oi /Ot")
-	set(CMAKE_CXX_FLAGS_DISTRIBUTION "/GS- /Gy /O2 /Oi /Ot")
+	if (OVERRIDE_CXX_FLAGS)
+		set(CMAKE_CXX_FLAGS_DEBUG "/GS /Od /Ob0 /RTC1")
+		set(CMAKE_CXX_FLAGS_RELEASE "/GS- /Gy /O2 /Oi /Ot")
+	endif()
+	set(CMAKE_CXX_FLAGS_DISTRIBUTION "${CMAKE_CXX_FLAGS_RELEASE}")
 	set(CMAKE_CXX_FLAGS_RELEASEASAN "-fsanitize=address /Od")
 	set(CMAKE_CXX_FLAGS_RELEASEUBSAN "-fsanitize=undefined,implicit-conversion,float-divide-by-zero,local-bounds -fno-sanitize-recover=all")
 	set(CMAKE_CXX_FLAGS_RELEASECOVERAGE "-fprofile-instr-generate -fcoverage-mapping")