Remove redundant definition of (p)netcdf variables for LANL machines

This commit removes an explicit definition of the netcdf and parallel
netcdf variables for CIME. These are removed because they are already
defined by the module files that are loaded for these machines.

cime_config/acme/machines/config_compilers.xml

@@ -1175,16 +1175,6 @@ for mct, etc.
 	<GPTL_CPPDEFS> -DHAVE_VPRINTF -DHAVE_GETTIMEOFDAY </GPTL_CPPDEFS>
 </compiler>
 
-<compiler MACH="mustang">
-    <NETCDF_PATH>$(NETCDF)</NETCDF_PATH>
-    <PNETCDF_PATH>$(PARALLEL_NETCDF)</PNETCDF_PATH>
-</compiler>
-
-<compiler MACH="wolf">
-    <NETCDF_PATH>$(NETCDF)</NETCDF_PATH>
-    <PNETCDF_PATH>$(PARALLEL_NETCDF)</PNETCDF_PATH>
-</compiler>
-
 <compiler COMPILER="gnu" MACH="mustang">
 	<ADD_CFLAGS>  -std=c99 </ADD_CFLAGS>
 </compiler>