Because of a change in the sources[1], that I missed before, the ports Makefile did not find the opencv header files any more. As a result the OpenCV module will not be build.
[1] SAGA GIS opencv version 4 support:
https://sourceforge.net/p/saga-gis/code/ci/1a4b6df792186480953f4fb20474f16b328a9a5c/
While here, remove not needed, OpenMP related, post-patch of configure files. These files are patched now via files/patch-configure.ac.
Bump portrevision to get a more functional SAGA GIS.
Tested on Poudriere. 'portlint -AC' is fine.