ufs_public_release: remove libxml2

[climbfuji]

Remove reference to libxml2, this not required for the CCPP static build. Avoids that users need to install libxml2 on their systems for something that doesn't get used at all.

Also fixes a bug for compiling on gaea (rename cmake/configure_gaea.cmake to cmake/configure_gaea.intel.cmake). Then, it is possible to compile the code using either

cd tests
./compile_cmake.sh $PWD/.. gaea.intel '32BIT=Y CCPP=Y STATIC=Y SUITES=FV3_GFS_v15p2,FV3_GFS_v16beta' 2>&1 | tee compile.log

or

module use -a $PWD/modulefiles/gaea.intel
module load fv3
export NETCDF=$NETCDF_DIR
./build.sh 2>&1 | tee build.log

However, for users outside of the ESRL organization, this still requires GFDL helpdesk to fix the permissions (cannot read /lustre/f2/pdata/esrl, permissions underneath are correct). I opened a ticket for this and they are working on it.

Associated PRs:

NCAR/ccpp-framework#261
NOAA-EMC/fv3atm#55
#46
Also: NOAA-EMC/fv3atm#56

For regression testing, see below.

[climbfuji]

Regression testing on hera.intel, cheyenne.intel and cheyenne.gnu: all tests pass. Regression test logs have been updated in this PR.

rt_cheyenne_gnu.log
rt_cheyenne_intel.log
rt_hera_intel.log

[climbfuji]

Ready to go!