gcc/cpp segfault on netbsd-9/amd64 building gobject-introspection

["John D. Baker" <jdbaker%consolidated.net@localhost>]

In a situation similar to that described in this thread:

  http://mail-index.netbsd.org/pkgsrc-users/2019/10/23/msg029716.html

after updating my pkgsrc to HEAD and running "pkg_rolling-replace",
building "gobject-introspection" caused 'cpp' to segfault.  This time,
it was on NetBSD/amd64-9.0_STABLE (which didn't exhibit a problem before).

As with the previous thread, explicitly rebuilding and replacing
"devel/glib2" allowed the subsequent build of "gobject-introspection" to
complete.

Just a heads-up in case anyone else encounters this.

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