According to #23223, manually setting `RUSTFLAGS` env var overrides
settings in `.cargo/config.toml`. Since users possibly may set their own
`RUSTFLAGS` when building, this creates an avenue where builds may fail
for really strange reasons that are difficult to debug.
This PR adds notes to the troubleshooting section to avoid setting
`RUSTFLAGS`, and offers alternatives which do not conflict.
This problem most recently affected nightly CI builders since we had
been setting `RUSTFLAGS` in our workflows to enable custom things like
gles or compiling with a specific target cpu. PR #23117 caused builds to
fail unless they were compiled with `-C target-feature=+crt-static`,
which due to this issue the `RUSTFLAGS` env var we set overrode the
`config.toml` compile flags, causing our builds to fail.
Release Notes:
- N/A
3c0acdea5e