Fix libxml2's python extension compilation
Fix libxml2's python extension compilation

libxml2 uses -L$(PYTHON_INCLUDES) instead of just $(PYTHON_INCLUDES)
for the CFLAGS

GStreamer/cerbero,lubosz/cerbero,AlertMe/cerbero,superdump/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,multipath-rtp/cerbero,flexVDI/cerbero,superdump/cerbero,cee1/cerbero-mac,fluendo/cerbero,justinjoy/cerbero,nzjrs/cerbero,nirbheek/cerbero,AlertMe/cerbero,atsushieno/cerbero,ford-prefect/cerbero,BigBrother-International/gst-cerbero,flexVDI/cerbero,multipath-rtp/cerbero,jackjansen/cerbero,ramaxlo/cerbero,justinjoy/cerbero,superdump/cerbero,jackjansen/cerbero-2013,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,GStreamer/cerbero,jackjansen/cerbero,cee1/cerbero-mac,centricular/cerbero,EricssonResearch/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,fluendo/cerbero,jackjansen/cerbero-2013,flexVDI/cerbero,nzjrs/cerbero,sdroege/cerbero,ramaxlo/cerbero,sdroege/cerbero,cee1/cerbero-mac,atsushieno/cerbero,BigBrother-International/gst-cerbero,ikonst/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,GStreamer/cerbero,AlertMe/cerbero,nicolewu/cerbero,nicolewu/cerbero,davibe/cerbero,nirbheek/cerbero,EricssonResearch/cerbero,centricular/cerbero,davibe/cerbero,fluendo/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,ikonst/cerbero,jackjansen/cerbero,nirbheek/cerbero-old,GStreamer/cerbero,brion/cerbero,brion/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,davibe/cerbero,sdroege/cerbero,GStreamer/cerbero,atsushieno/cerbero,ford-prefect/cerbero,nzjrs/cerbero,ramaxlo/cerbero,ikonst/cerbero,cee1/cerbero-mac,AlertMe/cerbero,jackjansen/cerbero-2013,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,nirbheek/cerbero,jackjansen/cerbero-2013,shoreflyer/cerbero,multipath-rtp/cerbero,multipath-rtp/cerbero,ramaxlo/cerbero,justinjoy/cerbero,ford-prefect/cerbero,nirbheek/cerbero,multipath-rtp/cerbero,davibe/cerbero,jackjansen/cerbero,ford-prefect/cerbero,ylatuya/cerbero,centricular/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,BigBrother-International/gst-cerbero,nirbheek/cerbero-old,fluendo/cerbero,OptoFidelity/cerbero,lubosz/cerbero,flexVDI/cerbero,superdump/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,jackjansen/cerbero-2013,OptoFidelity/cerbero,atsushieno/cerbero,lubosz/cerbero,AlertMe/cerbero,centricular/cerbero,shoreflyer/cerbero,brion/cerbero,ylatuya/cerbero,nirbheek/cerbero-old,nicolewu/cerbero,EricssonResearch/cerbero,lubosz/cerbero,sdroege/cerbero,nzjrs/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,ikonst/cerbero,ramaxlo/cerbero,shoreflyer/cerbero,shoreflyer/cerbero,nzjrs/cerbero,ylatuya/cerbero,flexVDI/cerbero,OptoFidelity/cerbero,justinjoy/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,brion/cerbero,ikonst/cerbero,EricssonResearch/cerbero,atsushieno/cerbero,sdroege/cerbero,fluendo/cerbero,ylatuya/cerbero,centricular/cerbero,BigBrother-International/gst-cerbero,brion/cerbero,shoreflyer/cerbero,OptoFidelity/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,BigBrother-International/gst-cerbero,EricssonResearch/cerbero,nirbheek/cerbero-old