[Bug 706719] Quote autogen.sh arguments when passing to autogen_options

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=706719
  GStreamer | common | git

--- Comment #8 from Kerrick Staley <bugs at kerrickstaley.com> 2013-08-26 08:15:11 UTC ---
This should work in the regular sh; I deliberately avoided arrays, which would
be more straightforward and less verbose, but are bash-specific.

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