Log Message:
* Ensure NETCDF is defined properly during the build.  As part of this
  change, remove some unnecessary changes to the configure script and
  makefiles that caused @NETCDF@ to be substituted since the existing
  mechanism (simply set NETCDFHOME in the environment) is more than
  sufficient.

* Remove some unnecessary changes to the configure script and makefiles
  to cause @LIBTOOL@ to be substituted.  We can simply pass in the
  right value via MAKE_ENV instead of hardcoding the value.

* Fix a place where we weren't calling the compiler correctly, which
  broke the build of certain programs that should be installed and
  which were already listed in the PLIST.

* Add --mode=MODE tags in the appropriate places to suppress the
  warnings from libtool that were cluttering the build log.

Commit approved during the deep freeze by <agc>.