package/opencv3: add patch to fix CMake 4 build issue

package/opencv3: add patch to fix CMake 4 build issue

Add a small patch to fix CMake 4 build issues. Unfortunately, while
cmake/OpenCVMinDepVersions.cmake provides a MIN_VER_CMAKE that we
could pass on the command line, cmake/OpenCVGenPkgconfig.cmake doesn't
use it, so we anyway have to patch the package.

Since opencv3 is basically unmaintained, there is no point sending
this patch upstream.

Fixes:

  https://autobuild.buildroot.net/results/cc857993920607958dd817c6a877ed9386c05738/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>