admin: fix typo in gsound.doap
build: Additional builddir != srcdir fix

Workaround automake's suboptimal handling of vala compilation
in the case of builddir != srcdir

https://bugzilla.gnome.org/show_bug.cgi?id=740825
build: Add bug report address to AC_INIT
admin: Add lgpl header to gsound-play.vala

https://bugzilla.gnome.org/show_bug.cgi?id=740931