[Bug 4934] Upgrade bugzilla to version 2.20

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=4934

[e-mail] changed:

What    |Removed                     |Added
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------- Additional Comments From [e-mail]  2006-26-03 09:04 -------
These fields also need to be added

alter table products add classification_id int;
alter table priority add sortkey int;
alter table bug_severity add sortkey int;
alter table rep_platform add sortkey int;
alter table op_sys add sortkey int;
alter table bug_status add sortkey int;
alter table resolution add sortkey int;