[Bug 752688] wayland: improve check for wayland-scanner

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752688

Thiago Sousa Santos <thiagossantos at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #307869|0                           |1
        is obsolete|                            |

--- Comment #3 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 320905
  --> https://bugzilla.gnome.org/attachment.cgi?id=320905&action=edit
configure: improve check for wayland-scanner binary

Updated to only check for wayland-scanner once. Works in my desktop
and my cross-compiling scenario.

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