Switch from std::result_of to std::invoke_result #17

Job	Run time
build-test-install (ubuntu, gcc, 1)	1m 46s
build-test-install (ubuntu, gcc, 2)	1m 44s
build-test-install (ubuntu, gcc, 3)	1m 50s
build-test-install (ubuntu, gcc, 4)	1m 24s
build-test-install (ubuntu, gcc, 5)	1m 40s
build-test-install (ubuntu, gcc, 6)	1m 17s
build-test-install (ubuntu, clang, 1)	2m 2s
build-test-install (ubuntu, clang, 2)	2m 2s
build-test-install (ubuntu, clang, 3)	1m 54s
build-test-install (ubuntu, clang, 4)	1m 38s
build-test-install (ubuntu, clang, 5)	1m 43s
build-test-install (ubuntu, clang, 6)	1m 24s
build-test-install (macos, gcc, 1)	1m 32s
build-test-install (macos, gcc, 2)	1m 25s
build-test-install (macos, gcc, 3)	1m 23s
build-test-install (macos, gcc, 4)	1m 22s
build-test-install (macos, gcc, 5)	1m 23s
build-test-install (macos, gcc, 6)	1m 47s
build-test-install (macos, clang, 1)	1m 36s
build-test-install (macos, clang, 2)	1m 21s
build-test-install (macos, clang, 3)	1m 15s
build-test-install (macos, clang, 4)	1m 8s
build-test-install (macos, clang, 5)	1m 11s
build-test-install (macos, clang, 6)	1m 8s
	36m 55s

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