Merge #3677

3677: Tell MSVC that main is still entry r=heinrich5991 a=Jupeyy

Need to wait for the artifacts to test, if this works, dont have VS currently

I wonder why VS doesnt output an error that WinMain isnt found :D

## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Jupeyy <jupjopjap@gmail.com>

CMakeLists.txt

@@ -1900,6 +1900,10 @@ if(CLIENT)
   )
   target_link_libraries(${TARGET_CLIENT} ${LIBS_CLIENT})
 
+  if(MSVC)
+    target_link_options(${TARGET_CLIENT} PRIVATE /ENTRY:mainCRTStartup)
+  endif()
+
   target_include_directories(${TARGET_CLIENT} PRIVATE
     ${CURL_INCLUDE_DIRS}
     ${FREETYPE_INCLUDE_DIRS}