Supposed to use sys.stdin as the fileobj when the filename is `'-…

…'`. Can guess that this is the case from the command line parameters:

    >>> failed test: /home/steven/programming/python/dev/packages/cfv/test/cfv -ZNVRMUI --unquote=no --fixpaths="" --strippaths=0 --showpaths=auto-relative --progress=no --announceurl=url --noprivate_torrent -t bsdmd5 -zz -T -f -  {'stdin': '/tmp/tmpm65hbxli/test.C.bsdmd5.gz'}

This indeed fixes another test (fixes 16 more in total). Not sure why there was a "lovely hack" used previously, but got rid of this hack now.

lib/cfv/fileutil.py

@@ -128,7 +128,7 @@ def PeekFileNonseekable(fileobj, filename, encoding):
 def PeekFileGzip(filename, encoding):
     import gzip
     if filename == '-':
-        f = gzip.GzipFile(mode='rb', fileobj=BytesIO())  # lovely hack since gzip.py requires a bunch of seeking.. bleh.
+        f = gzip.GzipFile(mode='rb', fileobj=sys.stdin)
     else:
         f = gzip.open(filename, 'rb')
     try: