[add] gst-plugins-base: riff, add waveformatextension generic support
[add] xbmc: autotools, fix build hitting wrong config header
[add] bashdb: autoconf prefix test fix
[add] emacs-test-simple: autoconf, fall back to default datadir install location
[add] emacs-test-simple: autoreconf, don't force update
[add] realgud: autoconf, fall back to default datadir install location