[Samba] Lowercase characters on GPO IDs in Samba source files

[Miguel Medalha]

Turns out that I was at least half-right, after all.

I just opened the files contained in the last Samba release (contained 
in samba-4.6.5.tar.gz) and although the typos have been corrected in 
"./python/samba/provision/__init__.py", *they are still there* in 
"./examples/misc/adssearch.pl" and "./libgpo/gpo_util.c".

It happened that, before my first post, I had peeked into 
"./examples/misc/adssearch.pl" and it was there, that's why I posted.

Can we solve this very simple matter once and for all? If I can help in 
any way, I will gladly do it.