build

update darwin_arm64_gfortran to be able to use free-format f90 files … #310

Job	Run time
openad (global_ocean.90x40x15)	9m 19s
forward (offline_exf_seaice)	4m 16s
doc_html	2m 1s
forward (global_ocean.cs32x15)	3m 26s
doc_latex	3m 40s
forward (tutorial_deep_convection)	2m 41s
openad-other	0s
forward (aim.5l_cs)	1m 42s
forward (isomip)	3m 4s
forward (global_ocean.90x40x15)	1m 55s
forward (tutorial_plume_on_slope)	1m 38s
forward (tutorial_advection_in_gyre)	1m 27s
forward (hs94.cs-32x32x5)	1m 39s
forward (tutorial_global_oce_biogeo)	1m 36s
forward (tutorial_global_oce_in_p)	1m 15s
forward (tutorial_cfc_offline)	1m 16s
	40m 55s

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