command m4 takes command-line argument FILE, it reads stdin if FILE is '-'

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1750 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
Ubuntu may not like this way of stdout and stderr redirect

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1751 c368ceb8-fd28-0410-a457-e46ee1d7cd4a