Fix OSX build (benchmark step) (#2933) #447

Job	Run time
Bazel	19m 29s
WASM wasm32/scalar	25m 13s
Ubuntu Build release	6m 18s
Ubuntu Build debug	9m 29s
WASM wasm32/simd-128	24m 44s
Ubuntu Build asan	41m 58s
WASM wasm32/simd-256	23m 43s
Ubuntu Build msan	1h 52m 4s
Windows MSYS2 / mingw64	6m 53s
Windows MSYS2 / clang64	16m 9s
Ubuntu Build scalar	17m 53s
Windows MSYS2 / mingw32	6m 10s
Ubuntu Build lowprecision	9m 11s
Windows MSYS2 / clang32	22m 42s
Ubuntu Build coverage	2h 6m 27s
Ubuntu Build release-nojpeg	6m 11s
Ubuntu Build release-lcms2	12m 43s
Ubuntu Build release-system-lcms2	5m 59s
Ubuntu Build release:minimal	10m 21s
Ubuntu Build release:gcc8	6m 20s
Ubuntu Build release:clang-7	12m 5s
MacOS Build release:osx	14m 32s
	8h 56m 34s

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