shieldfull does not build with gfortran compiler

[laurenchilutti]

Describe the bug
When I compile with GNU's fortran compiler, I get the following errors related to instances where the _DBL_ and _RL_ macros are used with line continuation character &

/ncrc/home1/Lauren.Chilutti/SHiELD_dev/SHiELD_SRC//GFDL_atmos_cubed_sphere/driver/SHiELDFULL/include/atmosphere.inc:86:86:
   86 |              tref(i,j) = _DBL_(_RL_(Atm(mygrid)%pt(i,j,kr) * (Atm(mygrid)%delp(i,j,kr)/ &
      |                                                                                      1
Error: Expected a right parenthesis in expression at (1)
/ncrc/home1/Lauren.Chilutti/SHiELD_dev/SHiELD_SRC//GFDL_atmos_cubed_sphere/driver/SHiELDFULL/include/atmosphere.inc:147:105:

  147 |               wm(i,j) = wm(i,j) + _DBL_(_RL_(Atm(mygrid)%delp(i,j,k) * ( Atm(mygrid)%q(i,j,k,sphum)   +  &
      |                                                                                                         1
Error: Syntax error in expression at (1)
/ncrc/home1/Lauren.Chilutti/SHiELD_dev/SHiELD_SRC//GFDL_atmos_cubed_sphere/driver/SHiELDFULL/include/atmosphere.inc:86:86:

   86 |              tref(i,j) = _DBL_(_RL_(Atm(mygrid)%pt(i,j,kr) * (Atm(mygrid)%delp(i,j,kr)/ &
      |                                                                                      1
Error: Expected a right parenthesis in expression at (1)
/ncrc/home1/Lauren.Chilutti/SHiELD_dev/SHiELD_SRC//GFDL_atmos_cubed_sphere/driver/SHiELDFULL/include/atmosphere.inc:147:105:

  147 |               wm(i,j) = wm(i,j) + _DBL_(_RL_(Atm(mygrid)%delp(i,j,k) * ( Atm(mygrid)%q(i,j,k,sphum)   +  &
      |                                                                                                         1
Error: Syntax error in expression at (1)

To Reproduce
compile ./COMPILE shieldfull gnu

Expected behavior
successful build - executable found in the /bin directory

System Environment
Describe the system environment, include:
Gaea c5 with gcc-native/13.2

Additional context
If I allow everything to go on one really long line it compiles.