Fix extern C wrapping glib headers (!7062) · Merge requests · Inkscape / inkscape

extern C was wrapping the includes of headers which in turn included glib.h. glib 2.84 started to include C++ code in some of its headers which breaks when wrapped with extern C, see https://gitlab.gnome.org/GNOME/glib/-/issues/3631

Fix by only wrapping our own code with extern C.

Fixes #5615 (closed)

Fix extern C wrapping glib headers

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