package/rygel: fix g_ir_compiler calls

Fix the following build failure raised since bump to version 0.40.2 in
commit 6acdbb81:

[108/298] Generating src/librygel-core/RygelCore-2.6.typelib with a custom command
FAILED: src/librygel-core/RygelCore-2.6.typelib
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/nios2-buildroot-linux-gnu/sysroot/usr/bin/g-ir-compiler --output src/librygel-core/RygelCore-2.6.typelib /home/giuliobenetti/autobuild/run/instance-3/output-1/build/rygel-0.40.2/build/src/librygel-core/RygelCore-2.6.gir
Could not find GIR file 'GUPnP-1.2.gir'; check XDG_DATA_DIRS or use --includedir
error parsing file /home/giuliobenetti/autobuild/run/instance-3/output-1/build/rygel-0.40.2/build/src/librygel-core/RygelCore-2.6.gir: Failed to parse included gir GUPnP-1.2

Fixes:
 - http://autobuild.buildroot.org/results/2b8956818f03f66a53480f7ed5fc0abb4f05288d



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>