Bug in gcycle if INTERNAL_FILE_NML is not defined, unused modules in radiation_surface.f

[climbfuji]

Description

From @matusmartini:

gycle.F90

For your information, to compile I had to comment out lines around the following:
inquire (file=trim(Model%fn_nml),exist=exists)

I think the UFS/SCM don't have the problem, because the CPP macro to read the internal namelist is defined.

Fix by removing Model% and making sur that fn_nml is in the argument list.

radiation_surface.f

One other thing I noticed is that the following two modules in radiation_surface.f are not being used:

     use set_soilveg_ruc_mod,  only: set_soilveg_ruc
     use namelist_soilveg_ruc

It was throwing a compilation error, and when I removed the lines, it was not complaining anymore.

[dustinswales]

Resolved in #956