Update netcdf_par.h test for newer netcdf libraries.

* For netcdf_c version 4.7 it's now mandatory to first include netcdf.h.

configure

@@ -31204,12 +31204,15 @@ fi
       CFLAGS="$CFLAGS $MPI_C_INCLUDE"
       for ac_header in netcdf_par.h
 do :
-  ac_fn_c_check_header_mongrel "$LINENO" "netcdf_par.h" "ac_cv_header_netcdf_par_h" "$ac_includes_default"
+  ac_fn_c_check_header_compile "$LINENO" "netcdf_par.h" "ac_cv_header_netcdf_par_h" "$ac_includes_default
+#include <netcdf.h>
+"
 if test "x$ac_cv_header_netcdf_par_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_NETCDF_PAR_H 1
 _ACEOF
  ac_fn_c_check_decl "$LINENO" "MPI_Bcast" "ac_cv_have_decl_MPI_Bcast" "$ac_includes_default
+#include <netcdf.h>
 #include <netcdf_par.h>
 "
 if test "x$ac_cv_have_decl_MPI_Bcast" = xyes; then :

configure.ac

@@ -265,13 +265,15 @@ dnl test properties of MPI system
            [HAVE_PARALLEL_NC4=1],
            [AC_MSG_WARN([The supplied netCDF library does not support MPI parallel invocations])],
            [AC_INCLUDES_DEFAULT
+@%:@include <netcdf.h>
 @%:@include <netcdf_par.h>])],
         [AC_CHECK_DECL([MPI_Bcast],
            [HAVE_PARALLEL_NC4=1],
            [AC_MSG_WARN([The supplied netCDF library does not support MPI parallel invocations])],
            [AC_INCLUDES_DEFAULT
 @%:@include <netcdf.h>])
-])
+],[AC_INCLUDES_DEFAULT
+@%:@include <netcdf.h>])
       dnl if not both scales-ppm and yaxt are available, netcdf can only be
       dnl used in serial mode
       AS_IF([test x$enable_ppm != xyes],