Don't pass -fPIC by default on wasm #1939

Job	Run time
Test build-std (aarch64-tvos)	1m 42s
Test build-std (aarch64-tvos-sim)	1m 42s
Clippy	15s
Test wasm (wasm32-unknown-unknown)	30s
Test build-std (x86_64-tvos)	1m 41s
Test CUDA support	48s
MSRV (ubuntu-latest)	21s
Rustfmt	10s
MSRV (windows-latest)	41s
semver-checks	11s
MSRV (macos-latest)	28s
Test wasm32-wasip1-thread	35s
Test (stable)	1m 40s
Test (beta)	1m 42s
Test (nightly)	1m 19s
Test (linux32)	2m 7s
Test (macos)	3m 0s
Test (aarch64-macos)	2m 1s
Test (aarch64-ios)	1m 14s
Test (win32)	3m 24s
Test (win64)	3m 32s
Test (mingw32)	3m 16s
Test (mingw64)	3m 7s
Test (windows-2019)	4m 36s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 52s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	4m 0s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	4m 16s
	51m 10s

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