Update README to include Archlinux AUR package link

[htfy96]

Just created an AUR repo at https://aur.archlinux.org/packages/wasi-libc-git/. Add its link to README to help fellow Archlinux users.

[sbc100]

Pretty cool. Does that that arch linux user who install this packages can just type clang -target wam32-wasi hello.c -o out.wasm have it just work?

Is there some way I can see the package contents (just out of interest).

[sbc100]

Perhaps put "Arch Linux" in the heading here.. since its more meaningful that "AUR package"... I had to look up that the latter was.

You can also ways say something like "For Arch Linux there is a unofficial (AUR) package..."

[htfy96]

Pretty cool. Does that that arch linux user who install this packages can just type clang -target wam32-wasi hello.c -o out.wasm have it just work?

The usage is printed out after installation at (wasi-libc.install):

post_install() {
  echo "Use this lib with clang --target=wasm32-unknown-wasi --sysroot /opt/wasi-libc"
}

Is there some way I can see the package contents (just out of interest).

Users are supposed to build the package on their own machines. Attached the package built on my machine below.
wasi-libc-prebuilt.zip

[sbc100]

Pretty cool. Does that that arch linux user who install this packages can just type clang -target wam32-wasi hello.c -o out.wasm have it just work?

The usage is printed out after installation at (wasi-libc.install):

post_install() {
  echo "Use this lib with clang --target=wasm32-unknown-wasi --sysroot /opt/wasi-libc"

Sounds good. I wonder if one day we could make this work with normal multi-arch path heirchary to avoid the need to specify a sysroot. i.e. install in /usr/lib/wam32-wasi-unknown and /usr/include/wasm32-wasi-unknown and then clang should be able pick them up by default? I'm not sure this works today but I think its a good goal.

}

> Is there some way I can see the package contents (just out of interest).

Users are supposed to build the package on their own machines. Attached the package built on my machine below.
[wasi-libc-prebuilt.zip](https://github.com/WebAssembly/wasi-libc/files/6057735/wasi-libc-prebuilt.zip)

[sbc100]

lgtm, but I'll leave it to @pchickey or @sunfishcode to give the final approval.

[htfy96]

Pretty cool. Does that that arch linux user who install this packages can just type clang -target wam32-wasi hello.c -o out.wasm have it just work?

The usage is printed out after installation at (wasi-libc.install):

post_install() {
  echo "Use this lib with clang --target=wasm32-unknown-wasi --sysroot /opt/wasi-libc"

Sounds good. I wonder if one day we could make this work with normal multi-arch path heirchary to avoid the need to specify a sysroot. i.e. install in /usr/lib/wam32-wasi-unknown and /usr/include/wasm32-wasi-unknown and then clang should be able pick them up by default? I'm not sure this works today but I think its a good goal.

Yeah I think that should eventually be the case, but I would like to postpone it until #154 gets merged, as with CMake we can easily install to multi-arch paths with CMAKE_INSTALL_INCLUDEDIR/CMAE_INSTALL_LIBDIR if we specifies target types in CMakeLists.txt properly.

[sunfishcode]

Looks good to me.