spec: add support for building on EPEL 10 #179

Job	Run time
check / clang-checks	1m 38s
check / editor-config	13s
build-os-matrix	4s
build (oraclelinux:9) / build	2m 0s
rpm-build (oraclelinux:9) / rpm-build	5m 52s
make-tests (oraclelinux:9) / tests	1m 50s
rpm-install (oraclelinux:9) / rpm-install	1m 19s
	12m 56s

Provide feedback