[AppDB] remove even more unused functions

[Tony Lambregts]

Jonathan Ernst wrote:
> This patch removes unused functions from include/util.php
> 
> Changelog:
> - remove unused functions in include/util.php
> 
> Files changed:
> - include/util.php

I believe you got carried away...

two of those functions are used by make_bugzilla_version_list():
openbugzilladb() and closebugzilladb()

values() is used in qclass.php which is used in stdquery.php which is used by
query_appbyvendor.php, pn_buttons.php, appversion,php and a few others.

If those files are not used then we should remove them first.