pkgconfig: add back support for builddir != srcdir case in uninstalled setup

Attempt to add back support for builddir != srcdir. Use absolute paths
instead of relative paths based on pcfiledir this time to make things
clearer - there's not really any need for uninstalled trees to be
relocatable without re-running configure.

pkgconfig/gstreamer-base-uninstalled.pc.in

@@ -1,13 +1,13 @@
 # the standard variables don't make sense for an uninstalled copy
 prefix=
 exec_prefix=
-libdir=${pcfiledir}/../libs/gst/base
+libdir=
-includedir=${pcfiledir}/..
+includedir=
 
 Name: GStreamer base classes, uninstalled
 Description: Base classes for GStreamer elements, Not Installed
 Requires: gstreamer-@GST_MAJORMINOR@ = @VERSION@
 Version: @VERSION@
 
-Libs: ${libdir}/libgstbase-@GST_MAJORMINOR@.la
+Libs: @abs_top_builddir@/libs/gst/base/libgstbase-@GST_MAJORMINOR@.la
-Cflags: -I${includedir}
+Cflags: -I@abs_top_srcdir@/libs -I@abs_top_builddir@/libs

pkgconfig/gstreamer-check-uninstalled.pc.in

@@ -1,13 +1,13 @@
 # the standard variables don't make sense for an uninstalled copy
 prefix=
 exec_prefix=
-libdir=${pcfiledir}/../libs/gst/check
+libdir=
-includedir=${pcfiledir}/..
+includedir=
 
 Name: GStreamer check unit testing, uninstalled
 Description: Unit testing helper library for GStreamer modules, Not Installed
 Requires: gstreamer-@GST_MAJORMINOR@ = @VERSION@
 Version: @VERSION@
 
-Libs: ${libdir}/libgstcheck-@GST_MAJORMINOR@.la -lm
+Libs: @abs_top_builddir@/libs/gst/check/libgstcheck-@GST_MAJORMINOR@.la @LIBM@
-Cflags: -I${includedir}
+Cflags: -I@abs_top_srcdir@/libs -I@abs_top_builddir@/libs

pkgconfig/gstreamer-controller-uninstalled.pc.in

@@ -1,13 +1,13 @@
 # the standard variables don't make sense for an uninstalled copy
 prefix=
 exec_prefix=
-libdir=${pcfiledir}/../libs/gst/controller
+libdir=
-includedir=${pcfiledir}/..
+includedir=
 
 Name: GStreamer controller, uninstalled
 Description: Dynamic parameter control for GStreamer elements, Not Installed
 Requires: gstreamer-@GST_MAJORMINOR@ = @VERSION@
 Version: @VERSION@
 
-Libs: ${libdir}/libgstcontroller-@GST_MAJORMINOR@.la
+Libs: @abs_top_builddir@/libs/gst/controller/libgstcontroller-@GST_MAJORMINOR@.la
-Cflags: -I${includedir}
+Cflags: -I@abs_top_srcdir@/libs -I@abs_top_builddir@/libs

pkgconfig/gstreamer-dataprotocol-uninstalled.pc.in

@@ -1,13 +1,13 @@
 # the standard variables don't make sense for an uninstalled copy
 prefix=
 exec_prefix=
-libdir=${pcfiledir}/../libs
+libdir=
-includedir=${pcfiledir}/..
+includedir=
 
 Name: GStreamer data protocol library, uninstalled
 Description: Data protocol for plug-ins, Not Installed
 Requires: gstreamer-@GST_MAJORMINOR@ = @VERSION@
 Version: @VERSION@
 
-Libs: ${libdir}/gst/dataprotocol/libgstdataprotocol-@GST_MAJORMINOR@.la
+Libs: @abs_top_builddir@/libs/gst/dataprotocol/libgstdataprotocol-@GST_MAJORMINOR@.la
-Cflags: -I${includedir} -I${includedir}/libs
+Cflags: -I@abs_top_srcdir@/libs -I@abs_top_builddir@/libs

pkgconfig/gstreamer-net-uninstalled.pc.in

@@ -1,14 +1,13 @@
 # the standard variables don't make sense for an uninstalled copy
 prefix=
 exec_prefix=
-libdir=${pcfiledir}/../libs/gst/net
+libdir=
-
+includedir=
-includedir=${pcfiledir}/..
 
 Name: GStreamer networking library, uninstalled
 Description: Network-enabled GStreamer plug-ins and clocking, uninstalled
 Requires: gstreamer-@GST_MAJORMINOR@ = @VERSION@
 Version: @VERSION@
 
-Libs: ${libdir}/libgstnet-@GST_MAJORMINOR@.la
+Libs: @abs_top_builddir@/libs/gst/net/libgstnet-@GST_MAJORMINOR@.la
-Cflags: -I${includedir}
+Cflags: -I@abs_top_srcdir@/libs -I@abs_top_builddir@/libs

pkgconfig/gstreamer-uninstalled.pc.in

@@ -1,14 +1,16 @@
 # the standard variables don't make sense for an uninstalled copy
 prefix=
 exec_prefix=
-libdir=${pcfiledir}/..
+libdir=
-includedir=${pcfiledir}/..
+# includedir is builddir because it is used to find gstconfig.h in places
-toolsdir=${pcfiledir}/../tools
+includedir=@abs_top_builddir@
-pluginsdir=${pcfiledir}/..
+toolsdir=@abs_top_builddir@/tools
+pluginsdir=@abs_top_builddir@
 
 Name: GStreamer Uninstalled
 Description: Streaming media framework, Not Installed
 Version: @VERSION@
 Requires: @GST_PKG_DEPS@@LIBXML_PKG@
-Libs: ${libdir}/gst/libgstreamer-@GST_MAJORMINOR@.la
+Libs: @abs_top_builddir@/gst/libgstreamer-@GST_MAJORMINOR@.la
-Cflags: -I${includedir} -I${includedir}/libs
+# FIXME: the libs dir doesn't really belong here
+Cflags: -I@abs_top_srcdir@ -I@abs_top_srcdir@/libs -I@abs_top_builddir@ -I@abs_top_builddir@/libs