Building Alpine linux now requires libc++ (and then prints warnings)

[hayd]

Running deno executable on alpine (frolvlad/alpine-glibc since glibc is required) fails since 1.8.0:

# running deno
deno: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory

if I install libstdc++ via apk add libstdc++ I see (when running deno) a warning repeated 5 times:

deno: /usr/lib/libstdc++.so.6: no version information available (required by deno)
deno: /usr/lib/libstdc++.so.6: no version information available (required by deno)
deno: /usr/lib/libstdc++.so.6: no version information available (required by deno)
deno: /usr/lib/libstdc++.so.6: no version information available (required by deno)
deno: /usr/lib/libstdc++.so.6: no version information available (required by deno)
Download https://deno.land/std/examples/welcome.ts
Warning Implicitly using latest version (0.89.0) for http://deno.land/std/examples/welcome.ts
Download https://deno.land/std@0.89.0/examples/welcome.ts
Check https://deno.land/std/examples/welcome.ts
Welcome to Deno!

This is a regression since previously libstdc++ was not required to be dynamically linked. As well as the warning being somewhat loud/unnecessary (?).

cc @lucacasonato @caspervonb

https://github.com/hayd/deno-docker/runs/2024710911?check_suite_focus=true

[lucacasonato]

This is blocked on wgpu 0.8 release. Once that is out we will disable the new cross feature on wgpu. For reference, wgpu 0.8 has no ETA yet. For now just install libc++.

[bnoordhuis]

#9760 will fix this.