ruby.git/wasm/README.md, branch v3_2_11

wasm/README.md: Add a note about the Ruby built for wasm. [ci skip]

2022-11-10T22:57:25+00:00

The Ruby built for wasm cannot be execute without a WebAssembly runtime.

```
$ ruby-wasm32-wasi/usr/local/bin/ruby -e 'puts "a"'
bash: ruby-wasm32-wasi/usr/local/bin/ruby: cannot execute binary file: Exec format error
```

Because the Ruby's file type is different from the one built normally, that is
the `/usr/local/ruby-3.2.0-preview2/bin/ruby` below.

```
$ file ruby-wasm32-wasi/usr/local/bin/ruby
ruby-wasm32-wasi/usr/local/bin/ruby: WebAssembly (wasm) binary module version 0x1 (MVP)

$ file /usr/local/ruby-3.2.0-preview2/bin/ruby
/usr/local/ruby-3.2.0-preview2/bin/ruby: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=a37822085e285c0971159982e7642dda88cea606, for GNU/Linux 3.2.0, with debug_info, not stripped
```

[wasm] get rid of workaround use of older binaryen and update to latest

2022-07-06T02:59:38+00:00

We no longer need to use older version of binaryen since the blocker
issue has been resolved https://github.com/WebAssembly/binaryen/issues/4401

wasm/README.md: add manual config.guess download and autoconf steps

2022-03-15T01:25:12+00:00

Autoconf distributed with Ubuntu 22.04 is very old and doesn't support
WASI as an OS, so add instructions to download the latest config.guess,
then run `./autogen.sh`.

See also: https://github.com/ruby/chkbuild/commit/2297012efd6364f6fde45f54531b6fc0f0838ec9

[wasm] wasm/README.md: write a brief instruction to cross build

2022-01-19T02:19:06+00:00