build: borrow CMake modules from qt-gstreamer for Linux compatibility

Almost certainly breaks Windows compat, but will need to update it anyways to work with the newer GStreamer SDK.

cmake/modules/FindGObject.cmake

@@ -0,0 +1,63 @@
+# - Try to find GObject
+# Once done this will define
+#
+#  GOBJECT_FOUND - system has GObject
+#  GOBJECT_INCLUDE_DIR - the GObject include directory
+#  GOBJECT_LIBRARIES - the libraries needed to use GObject
+#  GOBJECT_DEFINITIONS - Compiler switches required for using GObject
+
+# Copyright (c) 2006, Tim Beaulen <tbscope@gmail.com>
+# Copyright (c) 2008 Helio Chissini de Castro, <helio@kde.org>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+
+IF (GOBJECT_INCLUDE_DIR AND GOBJECT_LIBRARIES)
+   # in cache already
+   SET(GObject_FIND_QUIETLY TRUE)
+ELSE (GOBJECT_INCLUDE_DIR AND GOBJECT_LIBRARIES)
+   SET(GObject_FIND_QUIETLY FALSE)
+ENDIF (GOBJECT_INCLUDE_DIR AND GOBJECT_LIBRARIES)
+
+IF (NOT WIN32)
+   FIND_PACKAGE(PkgConfig REQUIRED)
+   # use pkg-config to get the directories and then use these values
+   # in the FIND_PATH() and FIND_LIBRARY() calls
+   PKG_CHECK_MODULES(PKG_GOBJECT2 REQUIRED gobject-2.0)
+   SET(GOBJECT_DEFINITIONS ${PKG_GOBJECT2_CFLAGS})
+ENDIF (NOT WIN32)
+
+FIND_PATH(GOBJECT_INCLUDE_DIR gobject/gobject.h
+   HINTS ${PKG_GOBJECT2_INCLUDE_DIRS} ${PKG_GOBJECT2_INCLUDEDIR}
+   PATHS /usr/include/glib-2.0/
+   PATH_SUFFIXES glib-2.0
+   )
+
+FIND_LIBRARY(_GObjectLibs NAMES gobject-2.0
+   HINTS
+   ${PKG_GOBJECT2_LIBRARY_DIRS}
+   ${PKG_GOBJECT2_LIBDIR}
+   )
+FIND_LIBRARY(_GModuleLibs NAMES gmodule-2.0
+   HINTS
+   ${PKG_GOBJECT2_LIBRARY_DIRS}
+   ${PKG_GOBJECT2_LIBDIR}
+   )
+FIND_LIBRARY(_GThreadLibs NAMES gthread-2.0
+   HINTS
+   ${PKG_GOBJECT2_LIBRARY_DIRS}
+   ${PKG_GOBJECT2_LIBDIR}
+   )
+FIND_LIBRARY(_GLibs NAMES glib-2.0
+   HINTS
+   ${PKG_GOBJECT2_LIBRARY_DIRS}
+   ${PKG_GOBJECT2_LIBDIR}
+   )
+
+SET (GOBJECT_LIBRARIES ${_GObjectLibs} ${_GModuleLibs} ${_GThreadLibs} ${_GLibs})
+
+MARK_AS_ADVANCED(GOBJECT_INCLUDE_DIR GOBJECT_LIBRARIES)
+
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(GObject DEFAULT_MSG GOBJECT_INCLUDE_DIR GOBJECT_LIBRARIES)