Rpmbuild: Ensured the toolset is enabled when needed in the `%build` … #47

Job	Run time
check / editor-config	7s
check / clang-checks	1m 40s
build-os-matrix	2s
build (oraclelinux:9) / build	2m 37s
make-tests (oraclelinux:9) / tests	2m 24s
rpm-build (oraclelinux:9) / rpm-build	1m 37s
rpm-install	0s
	8m 27s

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