glib-demo: Remove use of deprecated gtk_dialog_get_action_area()

https://bugs.freedesktop.org/show_bug.cgi?id=82385
glib-demo: Replace use of deprecated gtk stock items

https://bugs.freedesktop.org/show_bug.cgi?id=82384
Makefile.am cleanups

Bug #79411
poppler: use poppler-data pkg-config for both cmake and autotools builds
poppler-page: getting quadrilaterals for area
poppler-page: get bounding box for quadrilaterals

Implementation of a function that returns the
bounding box for a set of quadrilaterals.