Disable optimization for jobserver pipe #1192

Job	Run time
Test CUDA support	1m 59s
Test build-std (aarch64-tvos)	5m 7s
Clippy	28s
Test build-std (aarch64-tvos-sim)	4m 49s
MSRV (ubuntu-latest)	29s
Rustfmt	13s
Test build-std (x86_64-tvos)	4m 47s
MSRV (windows-latest)	46s
Test (stable)	54s
Test (beta)	59s
Test (nightly)	1m 16s
Test (linux32)	1m 47s
Test (macos)	1m 42s
Test (aarch64-macos)	1m 14s
Test (aarch64-ios)	1m 28s
Test (win32)	2m 30s
Test (win64)	3m 9s
Test (mingw32)	2m 19s
Test (mingw64)	2m 52s
Test (windows-2019)	3m 21s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 58s
	46m 7s

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