gstconfig: Fix unaligned access support for the openrisc architecture
gstconfig: Fix unaligned access support for the openrisc architecture

Teach gstconfig.h.in about the openrisc (or1k) architecture.  Fixes
buildroot autobuild failure:

http://autobuild.buildroot.net/results/717/717d78ce0935749f477bdf3133b6f20057a28c01/build-end.log

https://bugzilla.gnome.org/show_bug.cgi?id=778866

StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer