wip simplify gettime #189

Job	Run time
makefile-analysis	38s
cmake-alpine-amd64-gcc	13s
makefile-alpine-amd64-gcc	11s
makefile-alpine-armv7-gcc	1m 0s
makefile-alpine-armv7-clang	1m 22s
cmake-ubuntu-20.04-x86_64	6s
makefile-alpine-aarch64-gcc	1m 23s
makefile-ubuntu-20.04-amd64-gcc	14s
cmake-ubuntu-20.04-i686	18s
makefile-alpine-aarch64-clang	1m 30s
makefile-ubuntu-20.04-amd64-gcc +openmp	5s
cmake-alpine-armv7-gcc	1m 4s
cmake-macos-11-x86_64	16s
makefile-alpine-s390x-gcc	1m 3s
makefile-ubuntu-20.04-amd64-clang	6s
cmake-alpine-armv7-clang	1m 30s
cmake-windows-2019-x86_64	1m 24s
makefile-alpine-s390x-clang	1m 24s
makefile-ubuntu-20.04-amd64-clang +openmp	10s
cmake-alpine-aarch64-gcc	1m 46s
cmake-windows-2019-i686	1m 7s
makefile-alpine-ppc64le-gcc	52s
makefile-macos-11-amd64-clang	16s
cmake-alpine-aarch64-clang	1m 50s
makefile-alpine-ppc64le-clang	1m 19s
cmake-alpine-s390x-gcc	1m 14s
cmake-alpine-s390x-clang	1m 43s
cmake-alpine-ppc64le-gcc	1m 4s
cmake-alpine-ppc64le-clang	1m 38s
	26m 46s

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