- openEMS doesn't support s390x, don't try to build for it

From https://build.opensuse.org/package/live_build_log/openSUSE:Factory:zSystems/openEMS/standard/s390x
[ 40s] CMake Error at CMakeLists.txt:173 (message):
[ 40s] Unsupported target architecture! Try porting openEMS to your
[ 40s] architecture...