[babl,gobject-introspection] Enable introspection in debug on Windows

[talregev]

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Eable introspection in debug on Windows
g-ir-scanner resolved its DLL directories from the debug gio-2.0.pc, so the release _giscanner extension loaded the debug GLib DLLs and died on the CRT mismatch (STATUS_STACK_BUFFER_OVERRUN). Preload the release GLib DLLs before importing _giscanner, and drop the babl workaround that disabled GIR in debug.

[talregev]

Kai Pastor (@dg0yt) let me know what you think.