Use HEMCO config files in Buildconf/camconf when running with GEOS-Chem

GEOS-Chem expects to use HEMCO configuration files that are included in
the GEOS-Chem repository. Those files get copied into Buildconf/camconf
during the first build of any GEOS-Chem compset. If not using GEOS-Chem
then HEMCO files are read from the input data path specified as namelist
defaults. This update adds a modifier to change the hemco_config_file and
hemco_diagn_file namelist parameters when building the namelist for a
GEOS-Chem compset to be simply HEMCO_Config.rc and HEMCO_Diagn.rc, with no
absolute path specified.

Signed-off-by: Lizzie Lundgren <[email protected]>

bld/build-namelist

@@ -2963,6 +2963,12 @@ if ($nl->get_value('use_hemco') =~ m/$TRUE/io) {
     # ignored at runtime when HEMCO is used.
     $nl->delete_variable('chem_inparm', 'ext_frc_specifier');
     $nl->delete_variable('chem_inparm', 'srf_emis_specifier');
+
+    # If using GEOS-Chem reset paths of HEMCO configuration files to local filename only
+    if ($chem =~ /geoschem/) {
+	$nl->set_variable_value('hemco_nl', 'hemco_config_file', "'HEMCO_Config.rc'");
+	$nl->set_variable_value('hemco_nl', 'hemco_diagn_file', "'HEMCO_Diagn.rc'");
+    }
 }
 
 # Physics options