C loader generator does not certify in Windows Universal apps
The function `LoadLibraryW` (https://github.com/Dav1dde/glad/blob/master/glad/lang/c/loader/__init__.py#L14) causes Windows Store certification to fail. 

There is another function, `LoadPackagedLibrary` (https://msdn.microsoft.com/library/windows/desktop/hh447159.aspx) that can be used in place. However this function is only supported on Windows 8 and above, so should probably only be used if building for Windows Universal Platform.

