use some macros to shorten the m4 file

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1864 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
use some macros to shorten the m4 file

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1865 c368ceb8-fd28-0410-a457-e46ee1d7cd4a