gitlab: fix ci recipe for darwin.

7 jobs for master in 4 minutes and 11 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #118512484
arm-linux-gnueabihf

00:01:28

passed #118512483
i686-linux-gnu

00:01:34

passed #118512487
i686-w64-mingw32

00:02:40

passed #118512489
universal-apple-darwin

00:02:16

passed #118512482
x86_64-linux-gnu

00:01:31

passed #118512485
x86_64-w64-mingw32

00:02:22

 
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passed #118512501
pack

00:00:36