Enforce levelization in libxrpl with CMake #4236

Job	Run time
dependencies (linux, gcc, Debug)	3m 26s
dependencies (linux, gcc, Release)	2m 20s
dependencies (linux, clang, Debug)	3m 3s
dependencies (linux, clang, Release)	2m 34s
coverage (linux, gcc, Debug)	14m 0s
conan	3m 17s
test (linux, gcc, Debug)	11m 7s
test (linux, gcc, Debug, -Dunity=ON)	8m 12s
test (linux, gcc, Release)	12m 1s
test (linux, gcc, Release, -Dunity=ON)	8m 17s
test (linux, clang, Debug)	9m 29s
test (linux, clang, Debug, -Dunity=ON)	6m 26s
test (linux, clang, Release)	11m 9s
test (linux, clang, Release, -Dunity=ON)	8m 38s
	1h 43m 59s

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