[Bug 20859] New: winetest.exe should trim too long tag names

http://bugs.winehq.org/show_bug.cgi?id=20859

Summary: winetest.exe should trim too long tag names
           Product: Wine
           Version: 1.1.33
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: download, source
          Severity: enhancement
          Priority: P2
         Component: testcases
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Found this the other day while testing my build script. If winetest.exe is
called like:
$ wine winetest.exe -c -t really_long_string_name_omg_wtf_bbq
winetest exits with:
Error: tag is too long (maximum 20 characters)

It would probably be better to just warn the user and trim the tag to the first
20 characters:
http://source.winehq.org/git/wine.git/?a=blob;f=programs/winetest/main.c#l10...

Should be pretty simple...