[Patch] cygport: Allow to clear default_excludes

[Christian Franke]

The cygport 0.3.8 "default_excludes" list is not suitable for all 
projects, in particular when aclocal.m4 is used in a non-automake 
project like bash (http://sourceware.org/ml/cygwin/2007-03/msg00613.html).

With the attached, the default_excludes list is cleared when when 
DIFF_EXCLUDES starts with '!' (Syntax borrowed from .cvsignore ;-)
Then all necessary excludes except CYGWIN-PATCHES must be specified, e.g:

DIFF_EXCLUDES="! config.* install-sh missing ..."

The patch also adds a missing blank for DIFF_EXCLUDES="-x foo ...".

Christian

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