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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 307869
  --> https://bugzilla.gnome.org/attachment.cgi?id=307869&action=edit
configure: improve check for wayland-scanner binary

The plugin doesn't need the wayland-scanner package to be built
or run, it only needs the wayland-scanner program during compile time.

When cross-compiling, build systems might not have the wayland-scanner
package for the target system as it is a developer's tool, while it should
still be possible to use wayland-scanner from the host system.

This patch fixes it by not requiring the wayland-scanner package but
just the binary itself.

Note that the check is done outside of the PKG_CHECK_MODULES
as it doesn't work inside of it.

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