added a function to remove flags #842

Job	Run time
Test CUDA support	1m 1s
Test (stable)	41s
Rustfmt	20s
Test (beta)	37s
MSRV (ubuntu-latest)	3m 35s
Test (nightly)	39s
MSRV (windows-latest)	4m 20s
Test (linux32)	1m 20s
Test (macos)	3m 9s
Test (aarch64-ios)	1m 9s
Test (win32)	1m 57s
Test (win64)	2m 3s
Test (mingw32)	1m 49s
Test (mingw64)	1m 57s
Test (windows-2019)	1m 40s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 25s
	28m 42s

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