[PATCH] fix build against recent gtkglarea

[Christian Becke]

Hi,

gdk_gl_{context,pixmap}_{ref,unref} have been deprecated in favour of plain 
g_object_{ref,unref} as of gtkglarea-2.0. guile-gtk still uses these symbols. 
Attached patch fixes this. See http://bugs.gentoo.org/show_bug.cgi?id=237634


Cheers,

Christian
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guile-gtk-2.0-g-object-ref.diff
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