bug#77214: `guix pull` fails with `autocrlf=true` in git config

[Jodi Jodingtonstinski]

Ideally `guix pull` would ignore this setting (and possibly all user git
settings?) if it does not work with it.
 This causes errors such as:
 `gnu/packages/music.scm:2732:1: invalid character in escape sequence:
#\return`
and can be resolved by disabling autocrlf and deleting
`~/.cache/guix/checkouts` (thanks Rutherther)