Feature ghost tuning #336

Job	Run time
t8code_w_shipped_submodules_tests / t8code_cmake_tests	4m 39s
preparation (OFF) / cmake_preparation	1m 14s
preparation (ON) / cmake_preparation	1m 17s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	7m 7s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	11m 45s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	8m 25s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	7m 56s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	3m 48s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	3m 9s
t8code_api_tests (ON, Debug) / t8code_cmake_tests	5m 0s
t8code_api_tests (ON, Release) / t8code_cmake_tests	3m 13s
t8code_tests (OFF, Debug) / t8code_cmake_tests	3m 16s
t8code_tests (ON, Debug) / t8code_cmake_tests	4m 26s
t8code_tests (OFF, Release) / t8code_cmake_tests	2m 48s
t8code_tests (ON, Release) / t8code_cmake_tests	3m 6s
	1h 11m 9s

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