Rollup merge of #107866 - sunfishcode:sunfishcode/wasi-lazy-environ, r=workingjubilee

Allow wasi-libc to initialize its environment variables lazily.

Use `__wasilibc_get_environ()` to read the environment variable list from wasi-libc instead of using `environ`. `environ` is a global variable which effectively requires wasi-libc to initialize the environment variables eagerly, and `__wasilibc_get_environ()` is specifically designed to be an alternative that lets wasi-libc intiailize its environment variables lazily.

This should have the side effect of fixing at least some of the cases of #107635.

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