check() set both variables to Debian paths when they were unset. On distros
with a different layout, such as ALT Linux, the paths do not exist, and
rustls-native-certs then loads roots only from them, so every TLS client
created afterwards in the app got an empty root store.
reqwest with rustls already finds the system store through
rustls-platform-verifier and openssl-probe, so the override is not needed.
Closes#3598
Timofey Maykov
101e1b068a