fix typo

Author: jswhit

config.sh

@@ -138,7 +138,7 @@ function build_netcdf {
            && mkdir build \
            && cd build \
            && export HDF5_PLUGIN_PATH=$BUILD_PREFIX/lib/netcdf-plugins \
-           && unset HDF5_PLUGIN_PATH
+           && unset HDF5_PLUGIN_PATH \
            && mkdir -p $HDF5_PLUGIN_PATH \
            && cmake ../ -DCMAKE_INSTALL_PREFIX=${BUILD_PREFIX} -DENABLE_NETCDF_4=ON -DENABLE_DAP=ON -DBUILD_SHARED_LIBS=ON -DENABLE_PLUGIN_INSTALL=NO=YES \
            && make -j4 \