Don't pass -fPIC by default on wasm #1937

Job	Run time
Test build-std (aarch64-tvos)	1m 38s
Test build-std (aarch64-tvos-sim)	1m 38s
Test (stable)	1m 29s
Test wasm (wasm32-unknown-unknown)	12s
Test build-std (x86_64-tvos)	1m 39s
Test (beta)	1m 32s
Clippy	16s
Test CUDA support	39s
Test (nightly)	1m 13s
MSRV (ubuntu-latest)	20s
Rustfmt	4s
Test (linux32)	1m 39s
semver-checks	1m 26s
MSRV (windows-latest)	41s
Test (macos)	1m 40s
MSRV (macos-latest)	27s
Test wasm32-wasip1-thread	29s
Test (aarch64-macos)	1m 29s
Test (aarch64-ios)	1m 33s
Test (win32)	1m 25s
Test (win64)	1m 23s
Test (mingw32)	1m 26s
Test (mingw64)	1m 20s
Test (windows-2019)	1m 24s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 23s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	1m 25s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	1m 24s
	31m 14s

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