fix: index() -> strchr()

[bb010g]

index() is deprecated.

[SamB]

Also, Android's Bionic omits index/rindex altogether: https://cs.android.com/android/platform/superproject/main/+/main:bionic/libc/include/strings.h; there'san implementation of index in ndk_cruft.cpp but I'm not sure what for: it's certainly not exported from libc.so...

[MatiasHiltunen]

This is much needed PR, more about it here: astral-sh/uv#7373 (comment)

[SamB]

Something along the lines of:

[patch.crates-io]
sys-info = { git = "https://github.com/FillZpp/sys-info-rs", rev = "refs/pull/118/head" }

in ~/.cargo/config.toml might help until such time as this gets merged.

I've got the uv tests failing nicely now (seemingly for the same reason as the Termux-provided uv was failing).