Merge branch 'stg/fix-dycore-only-build' into hotfix-v8.2.1 (PR #1221)

This merge fixes dycore-only (i.e., no-physics) builds for both stand-alone
applications and when MPAS-A is used as a dycore in CAM/CAM-SIMA.

Prior to this merge there were two issues in the atmosphere core's Registry.xml
file that caused dynamics-only builds to fail:

  * With the MPAS v8.2.0 release, the MPAS-A registry file introduced a new
    stream, da_state, which unconditionally included variables that exist only
    when physics are enabled.

  * Also beginning with the MPAS v8.2.0 release, the Registry.xml file
    unconditionally included a new registry file from Noah-MP, which is
    applicable only when physics are enabled.

This merge fixes MPAS-A dycore-only builds by guarding the above regions in the
Registry.xml file with the DO_PHYSICS macro.

* stg/fix-dycore-only-build:
  Fix MPAS-A dycore-only build

Author: mgduda

src/core_atmosphere/Registry.xml

@@ -1155,10 +1155,6 @@
 			<var_array name="scalars"/>
 			<var name="initial_time"/>
 			<var name="xtime"/>
-			<var name="cldfrac"/>
-			<var name="re_cloud" packages="mp_thompson_in;mp_wsm6_in"/>
-			<var name="re_ice" packages="mp_thompson_in;mp_wsm6_in"/>
-			<var name="re_snow" packages="mp_thompson_in;mp_wsm6_in"/>
 			<var name="u"/>
 			<var name="w"/>
 			<var name="rho"/>
@@ -1171,6 +1167,11 @@
 			<var name="uReconstructZonal"/>
 			<var name="uReconstructMeridional"/>
 			<var name="surface_pressure"/>
+#ifdef DO_PHYSICS
+			<var name="cldfrac"/>
+			<var name="re_cloud" packages="mp_thompson_in;mp_wsm6_in"/>
+			<var name="re_ice" packages="mp_thompson_in;mp_wsm6_in"/>
+			<var name="re_snow" packages="mp_thompson_in;mp_wsm6_in"/>
 			<var name="refl10cm_max"/>
 			<var name="rainc"/>
 			<var name="rainnc"/>
@@ -1209,6 +1210,7 @@
 			<var name="smois"/>
 			<var name="tslb"/>
 			<var name="h_oml_initial"/>
+#endif
                 </stream>
 	</streams>
 
@@ -3588,6 +3590,8 @@
 <!-- **************************************************************************************** -->
 
 #include "diagnostics/Registry_diagnostics.xml"
-#include "physics/Registry_noahmp.xml"
 
+#ifdef DO_PHYSICS
+#include "physics/Registry_noahmp.xml"
+#endif
 </registry>