gtkdochelper: print warnings

The GTK-Doc commands output was never printed, except in case of error.
So there was no way to see the warnings.

https://github.com/mesonbuild/meson/issues/2396
pull/3358/head
Sébastien Wilmet 7 years ago committed by Jussi Pakkanen
parent b515eac75c
commit 51a1952172
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