improve CMake status messages #88

Job	Run time
Dockerfile_openexr3-repo-root	6m 43s
Dockerfile-repo-root	4m 34s
ubuntu-18-04	1m 32s
fedora-36	2m 38s
fedora-37	2m 37s
fedora-38	2m 36s
fedora-latest	2m 41s
redhat-ubi8	4m 38s
redhat-ubi9	5m 17s
ubuntu-20-04	1m 43s
ubuntu-22-04	1m 22s
ubuntu-22-04-LTO	2m 12s
ubuntu-22-04-openexr33	3m 50s
ubuntu-latest	1m 52s
ubuntu-openexr2-static	2m 51s
ubuntu-openexr2-shared	3m 1s
	50m 7s

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