build: use $CMAKE_INSTALL_LIBDIR instead of hardcoding "lib" (#1589) #900

Job	Run time
build (--disable-openmp, --with-yaml)	14m 40s
build (--disable-openmp, --with-yaml)	5m 26s
build (--disable-openmp, --with-yaml)	5m 20s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input)	10m 14s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input)	5m 22s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input)	5m 17s
build (--disable-setting-flags, --with-yaml)	14m 21s
build (--disable-setting-flags, --with-yaml)	5m 25s
build (--disable-setting-flags, --with-yaml)	5m 23s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input)	10m 30s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input)	5m 24s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input)	5m 19s
build (--with-mpi=no, --with-yaml)	4m 4s
build (--with-mpi=no, --with-yaml)	3m 54s
build (--with-mpi=no, --with-yaml)	3m 54s
build (--disable-r8-default, --with-yaml)	14m 34s
build (--disable-r8-default, --with-yaml)	5m 25s
build (--disable-r8-default, --with-yaml)	5m 19s
build (--disable-r8-default, --enable-test-input=/home/unit_tests_input)	10m 21s
build (--disable-r8-default, --enable-test-input=/home/unit_tests_input)	5m 27s
build (--disable-r8-default, --enable-test-input=/home/unit_tests_input)	5m 19s
	2h 30m 58s

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