[Bug 789645] CMake modules fixes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789645

--- Comment #7 from Daniele E. Domenichelli <daniele.domenichelli at gmail.com> ---
Hello Tim-Philipp,

The paths detected by pkg-config are used as hint for the following
find_library and find_path calls.
By making them optional the pkg-config optional, cmake tries to detect the
libraries even if pkg-config is not available.

All the patches are required in order to fix the FindGStreamer module on a few
systems I've been using them (I tested the CMake modules only, not the whole
qt-gstreamer library). For example, on one of the systems (I cannot remember
which one, sorry) the gst.h and gstconfig.h files were in different folders
(patch 4 and 5)

Also the patch 3 fixes the QUIET argument for the find_package command that is
supposed to not print any message.

Let me know if you need any specific information about the patches.

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