Commit 8cf4b7a4 authored by Jehan's avatar Jehan

libgimp: reduce GObject Introspection warnings.

Thanks to Massimo for helping:

> To reduce the number of warnings down to 2, it is necessary to list
> gimptypes.h and gimpenums.h right after gimp.h and gimpui.h
> gimpuitypes.h at the start of libgimpui_headers_introspectable like
> they are in the corresponding list in
> Their order evidently matters

See #4018.
Some stuff are still wrong, but this is a first step in the right
parent 9326f4a7
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