[patch] devel/glib20: fix crash in multimedia/vlc

[Tijl Coosemans]

Hi,

The attached patch fixes these PRs for multimedia/vlc (all duplicates):
http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/172185
http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/183683
http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/186629

The vlc-cache-gen program dlopens each plugin, looks for some symbols
(like a description string), stores that into a cache file and then
dlcloses the plugin.  For some combinations of options this causes
libgobject to be loaded, unloaded and then loaded again (as a dependency
of some plugins).  This is not supported.  See:

https://bugzilla.gnome.org/show_bug.cgi?id=707298
https://git.gnome.org/browse/glib/commit/?h=glib-2-40&id=3662eb9759fe225d1c214db6927c667a1b733e8a

The attached patch has been derived from that commit.  It adds
-Wl,-z,nodelete to the libgobject linker flags.

Ok to commit?
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