[Bug 753849] opencv: configure.ac fixes for cross compilation problems

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753849

--- Comment #1 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Created attachment 309648
  --> https://bugzilla.gnome.org/attachment.cgi?id=309648&action=edit
Replace AC_CHECK_FILE with a "test -d" check

AC_CHECK_FILE is not suitable for cross compilation. For the OpenCV path check,
"test -d" is sufficient.

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