clean up CMakeLists commented code #2230

Job	Run time
linux-debug	1m 48s
linux-compat (manylinux1-x64)	1m 51s
linux-compiler-compat (clang-3)	2m 0s
linux-compat (manylinux1-x86)	1m 50s
linux-compiler-compat (clang-6)	2m 9s
linux-compat (manylinux2014-x64)	2m 35s
linux-compiler-compat (clang-8)	2m 10s
linux-compiler-compat (clang-9)	2m 8s
linux-compat (manylinux2014-x86)	1m 53s
linux-compiler-compat (clang-10)	2m 10s
linux-compat (fedora-34-x64)	1m 50s
linux-compiler-compat (clang-11)	2m 9s
linux-compiler-compat (gcc-4.8)	1m 52s
linux-compat (opensuse-leap)	2m 14s
linux-compiler-compat (gcc-5)	1m 54s
linux-compiler-compat (gcc-6)	1m 59s
linux-compiler-compat (gcc-7)	2m 8s
linux-compiler-compat (gcc-8)	2m 8s
linux-compat (rhel8-x64)	2m 3s
linux-compat (al2-x64)	1m 40s
clang-sanitizers (,thread)	2m 28s
downstream	1m 58s
clang-sanitizers (,address,undefined)	2m 33s
linux-byo-crypto	1m 37s
linux-shared-libs	1m 47s
macos	49s
macos-x64	53s
windows	1m 55s
windows-app-verifier	2m 33s
windows-debug	2m 19s
windows-shared-libs	2m 26s
windows-vc14 (x86)	1m 20s
windows-vc14 (x64)	1m 23s
freebsd	2m 27s
macos-debug	43s
openbsd	5m 17s
	1h 12m 59s

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