Remove excessive auto-inserted use statements

This commit removes four "use" statements that are auto-inserted into
inc/namelist_defines.inc 86 times.  This file is included in
mpas_$CORE_core_interface.F.  The ocean, sea ice, and land ice
components have these four use statements at the top as well, which
causes a compile bug for intel 17 in the ocean.  Martyn Corden, an intel
compile developer, recommended single use statements before "contains"
to speed up compilation time.  The atmosphere will need to add the use
statements to the top of
src/core_init_atmosphere/mpas_init_atm_core_interface.F

Author: mark-petersen

src/tools/registry/gen_inc.c

@@ -589,10 +589,6 @@ int parse_namelist_records_from_registry(ezxml_t registry)/*{{{*/
 
 		// Start defining new subroutine for namelist record.
 		fortprintf(fd, "   subroutine %s_setup_nmlrec_%s(configPool, unitNumber, dminfo)\n", core_string, nmlrecname);
-		fortprintf(fd, "      use mpas_derived_types\n");
-		fortprintf(fd, "      use mpas_dmpar\n");
-		fortprintf(fd, "      use mpas_pool_routines\n");
-		fortprintf(fd, "      use mpas_io_units\n");
 		fortprintf(fd, "      implicit none\n");
 		fortprintf(fd, "      type (mpas_pool_type), intent(inout) :: configPool\n");
 		fortprintf(fd, "      integer, intent(in) :: unitNumber\n");