help-version failure on cygwin

[Eric Blake]

A relevant portion of the log of the failure on cygwin:

+ mkdir dir-1088
+ test gzip.exe = '['
+ prog=gzip.exe
+ eval 'args=$gzip.exe_args'
++ args=.exe_args
+ env gzip.exe .exe_args
gzip: .exe_args: No such file or directory
+ echo FAIL: gzip.exe
FAIL: gzip.exe
+ fail=1

It looks like the help-version test needs to take $EXEEXT into account.  I
don't have time to look into this right now, but I'll get to it in the
next week or so if no one beats me to it.  Actually, updating this to use
the help-version used by grep may be good enough, since that uses shell
functions rather than eval to add arguments.

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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