added a function to remove flags #841

Job	Run time
Test (stable)	52s
MSRV (ubuntu-latest)	4m 12s
Test (beta)	49s
Rustfmt	21s
MSRV (windows-latest)	5m 22s
Test CUDA support	36s
Test (nightly)	47s
Test (linux32)	1m 28s
Test (macos)	1m 36s
Test (aarch64-ios)	1m 8s
Test (win32)	1m 32s
Test (win64)	1m 47s
Test (mingw32)	1m 59s
Test (mingw64)	1m 50s
Test (windows-2019)	1m 30s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 58s
	27m 47s

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