Reenabled the build and buildlinking with ffmpeg since we now have >0.8.
Added gtkmm and glibmm to BUILD_DEPENDS. Now, only disable GBA linking
function for OPSYS = NetBSD || SunOS (FXR didn't show OpenSolaris as having
shm_open and shm_unlink, so assuming OPSYS=SunOS doesn't either - correct
this if wrong, jperkin or someone.). Bump PKGREVISION.