Fall back to `rustc`'s default value for `crt-static` #1986

Job	Run time
Test (stable)	1m 40s
Clippy	21s
Test wasm (wasm32-unknown-unknown)	23s
Test (beta)	1m 20s
Test build-std (aarch64-tvos)	2m 21s
Test (nightly)	1m 14s
Test build-std (aarch64-tvos-sim)	2m 0s
Test CUDA support	46s
Test (linux32)	2m 42s
MSRV (ubuntu-latest)	23s
Test build-std (x86_64-tvos)	2m 13s
Test (macos)	3m 21s
MSRV (windows-latest)	38s
Test (aarch64-macos)	1m 27s
Rustfmt	21s
MSRV (macos-latest)	38s
semver-checks	15s
Test (aarch64-ios)	1m 12s
Test (win32)	3m 15s
Test wasm32-wasip1-thread	32s
Test (win64)	2m 29s
Test (mingw32)	3m 11s
Test (mingw64)	3m 7s
Test (windows-2019)	4m 19s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 48s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	5m 58s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	6m 39s
	56m 33s

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