Change Setup's package search field to case-insensitive

[Ralph Hempel]

Corinna Vinschen wrote:

>> To address the issue of StrStri, I am surprised that msvcrt doesn't have
>> something like this but, since it doesn't, I agree that it makes sense
>> to use whatever the OS provides.
> 
> msvcrt only supports strstr, not strcasestr, unfortunately.

Which begs the question:

   Does it make sense to lowercase the finder and findee to avoid pulling
   in yet another library?

Ralph