[Bug 775281] Allow simply setup an uninstalled environment based on msys2

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775281

--- Comment #6 from Scott D Phillips <scott.d.phillips at intel.com> ---
maybe add something like this:

> def should_gen_lib(self, dll):
>     lib_dir, dll_name = os.path.split(dll)
>     if lib_dir.endswith('bin'):
>         lib_dir = lib_dir[:-3] + 'lib'
> 
>     lib_name = self.get_libname(dll_name)
>     lib = os.path.join(lib_dir, lib_name)
>     if not os.path.exists(lib):
>         return True
>     return os.stat(dll).st_mtime_ns >= os.stat(lib).st_mtime_ns

and then you can change the check in make_libs to something like:

if f.endswith('.dll') and self.should_gen_lib(os.path.join(base, f)):

as an optimization to avoid unnecessary building of .lib files.

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