[Bug other/90142] contrib/download_prerequisites uses test ==

[roland.illig at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90142

--- Comment #2 from Roland Illig <roland.illig at gmx dot de> ---
Please just ignore the patch, if that's easier.

Portable shell programs should not use the == operator for test(1).