CMake: introduce rpm-msec and rpm-nemea target #25

Job	Run time
check / clang-checks	1m 40s
check / editor-config	11s
build-os-matrix	2s
build (oraclelinux:9) / build	2m 37s
make-tests (oraclelinux:9) / tests	2m 27s
rpm-build (oraclelinux:9) / rpm-build	3m 3s
	10m 0s

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