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cmake: shorten option to `TRURL_MANUAL` #76

Job	Run time
Cygwin	2m 24s
macOS	14s
Linux (default, valgrind, test-memory)	3m 15s
Linux (clang sanitizers, clang, test, clang, -fsanitize=address,undefined,signed-integer-overflow...	1m 19s
Windows	58s
	8m 10s

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