modules: rename internal LoadImages to avoid collision with win32
See https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-loadimagea / https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-loadimagew
And also use VLC_SUCCESS consistently in freetype. The 2 patches are unrelated but I don't think they need separate MR's (unless there are issues raised).