Fall back to `rustc`'s default value for `crt-static`/`static_flag` #44

Job	Run time
Clippy	16s
Test wasm (wasm32-unknown-unknown)	23s
Test CUDA support	45s
Test build-std (aarch64-tvos)	1m 44s
Rustfmt	25s
Test build-std (aarch64-tvos-sim)	1m 44s
MSRV (ubuntu-latest)	25s
semver-checks	19s
Test build-std (x86_64-tvos)	2m 0s
MSRV (windows-latest)	46s
MSRV (macos-latest)	29s
Test (stable)	1m 30s
Test wasm32-wasip1-thread	33s
Test (beta)	1m 27s
Test (nightly)	1m 16s
Test (linux32)	2m 26s
Test (macos)	3m 14s
Test (aarch64-macos)	1m 24s
Test (aarch64-ios)	1m 23s
Test (win32)	2m 26s
Test (win64)	2m 51s
Test (mingw32)	2m 47s
Test (mingw64)	2m 40s
Test (windows-2019)	2m 41s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 50s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	6m 26s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	5m 9s
	51m 19s

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