Precompiles inquirer for Node 4 compat

[arcanis]

Summary

Inquirer dropped support for Node 4. We recently upgraded via #6635, which breaks Node 4 compat.

This PR ensures that inquirer is properly transpiled in the legacy build.

Test plan

CI; ran yarn upgrade-interactive and yarn add lodash@doesnt-exist

[buildsize]

File name	Previous Size	New Size	Change
yarn-[version].noarch.rpm	1.1 MB	1.1 MB	1.48 KB (0%)
yarn-[version].js	4.46 MB	4.46 MB	-12 bytes (0%)
yarn-legacy-[version].js	4.63 MB	4.65 MB	17.35 KB (0%)
yarn-v[version].tar.gz	1.11 MB	1.11 MB	-612 bytes (0%)
yarn_[version]all.deb	812.61 KB	813.59 KB	1002 bytes (0%)