Remove dependency on GNAT CE when building branch #44

Job	Run time
sanity-check (ubuntu-latest, 2.0.0)	17s
sanity-check (ubuntu-latest, 1.2.2)	23s
sanity-check (ubuntu-latest, nightly)	42s
sanity-check (ubuntu-latest, source, master)	3m 30s
sanity-check (macos-latest, 2.0.0)	26s
sanity-check (macos-latest, 1.2.2)	56s
sanity-check (macos-latest, nightly)	24s
sanity-check (macos-latest, source, master)	7m 49s
sanity-check (windows-latest, 2.0.0)	2m 48s
sanity-check (windows-latest, 1.2.2)	4m 20s
sanity-check (windows-latest, nightly)	4m 54s
sanity-check (windows-latest, source, master)	7m 2s
	33m 31s

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