configure: add foo_select facility
configure: add foo_select facility

If an option 'foo' is enabled, all options listed in foo_select
are automatically enabled, unless explicitly disabled.  In the
latter case, foo is also disabled.

git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@15684 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg