Fall back to `rustc`'s default value for `crt-static` #1991

Job	Run time
Test wasm32-wasip1-thread	28s
Test wasm (wasm32-unknown-unknown)	17s
Clippy	13s
Test build-std (aarch64-tvos)	1m 40s
Test CUDA support	37s
MSRV (ubuntu-latest)	26s
Test build-std (aarch64-tvos-sim)	2m 31s
Rustfmt	16s
MSRV (windows-latest)	36s
Test build-std (x86_64-tvos)	2m 5s
MSRV (macos-latest)	27s
semver-checks	17s
Test (stable)	1m 35s
Test (beta)	1m 24s
Test (nightly)	1m 10s
Test (linux32)	2m 5s
Test (macos)	2m 50s
Test (aarch64-macos)	2m 19s
Test (aarch64-ios)	1m 15s
Test (win32)	2m 51s
Test (win64)	3m 42s
Test (mingw32)	2m 42s
Test (mingw64)	2m 59s
Test (windows-2019)	3m 42s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	4m 3s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	2m 44s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	5m 39s
	50m 53s

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