[Bug 747095] Disable g-ir-scanner cache on build

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747095

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 300651
  --> https://bugzilla.gnome.org/attachment.cgi?id=300651&action=edit
introspection: Don't use g-ir-scanner cache at compile time

It pollutes user directories and we don't need to cache it

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