Fixed test-header to work on Cygwin, which has a BUFSIZ of only 1024.  That caused an error message to be truncated.
Fixed test-header to work on Cygwin, which has a BUFSIZ of
only 1024.  That caused an error message to be truncated.

dscho/nmh,dscho/nmh,dscho/nmh,mcr/nmh,mcr/nmh,dscho/nmh