Unfortunately the autotools build system was removed in 0.60.0, and the
CMake one is a bit overeager in linking against system libraries that
happen to be installed on the build machine, and we currently don't
require CMake anyway, so avoid the problems by using a gbuild makefile
and a patch to add the generated header files.

Remove all current patches:

poppler-notests.patch.1: obsolete (autotools build system)

poppler-mac-fake.patch.1: presumed obsolete

ubsan.patch.0: presumably fixed differently upstream in
https://cgit.freedesktop.org/poppler/poppler/commit/?id=f43cb73939f85952d83afc87a6dc638dc1ae311b

poppler-libjpeg.patch.1: obsolete (autotools build system; there appears
to be no way to do this with CMake?)

0001-Fix-building-with-old-clang.patch.1: merged upstream

Change-Id: I271c87ab3ec25cc9d1e8fafb04dae7c004acc350
Reviewed-on: https://gerrit.libreoffice.org/56166
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>