Cleaned up configure.ac a little bit, added a check for libjpeg when compiling with hdf4 support.
Cleaned up configure.ac a little bit, added a check for libjpeg when compiling with hdf4 support.

Unidata/netcdf-c,Unidata/netcdf-c,Unidata/netcdf-c,Unidata/netcdf-c