revert fetch-cargo-deps change

Changed files
-3
pkgs
build-support
-3
pkgs/build-support/rust/fetch-cargo-deps
···
# Do any possible 'cargo update -p <pkgName> --precise <version>' ad-hoc updates
eval "$cargoUpdateHook"
-
# stdenv setup sets SSL_CERT_FILE to a nonexistent path; cargo doesn't like that
-
unset SSL_CERT_FILE
-
# Do the fetch
cargo fetch --verbose