min cmake 3.5 #96

Job	Run time
ubuntu-latest\|Debug\|CC=clang CXX=clang++	2m 34s
ubuntu-latest\|Release\|CC=gcc CXX=g++	3m 10s
ubuntu-latest\|Debug\|CC=gcc CXX=g++	1m 48s
ubuntu-latest\|Release\|CC=clang CXX=clang++	2m 31s
macos-latest\|Debug\|CC=clang CXX=clang++	1m 4s
macos-latest\|Release\|CC=gcc CXX=g++	1m 20s
macos-latest\|Release\|CC=clang CXX=clang++	1m 19s
macos-latest\|Debug\|CC=gcc CXX=g++	1m 9s
	14m 55s

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