[Bug 776399] New: configure fails to detect QPA during cross compilation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776399

            Bug ID: 776399
           Summary: configure fails to detect QPA during cross compilation
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: stepan.salenikovich at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 342393
  --> https://bugzilla.gnome.org/attachment.cgi?id=342393&action=edit
patch

When using yocto to cross compile gst-plugins-bad, this check fails:

QPA_INCLUDE_PATH=`$PKG_CONFIG --variable=includedir
Qt5Core`/QtGui/${QT_VERSION}/QtGui
AS_IF([test -f "$QPA_INCLUDE_PATH/qpa/qplatformnativeinterface.h"], [...

This is because QPA_INCLUDE_PATH is "/usr/include/qt5/QtGui/5.7.0/QtGui", but
it needs to be prefixed by $PKG_CONFIG_SYSROOT_DIR so that
qplatformnativeinterface.h is detected during the cross compile.

This is the solution for the opencv check earlier:

dnl the OpenCV prefix is used at runtime for some object properties, and also
  dnl used here to detect which directory is the correct one. For the second
  dnl case, make sure the right sysroot is used, ensuring correct behavior
  dnl during cross compilation.
if test -d "$PKG_CONFIG_SYSROOT_DIR/$OPENCV_PREFIX/share/opencv/"; then

I've attached the patch which uses the same approach

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