Fixing a compiler warning in create_xgrid.c

[BijuThomas-NOAA]

DESCRIPTION OF CHANGES:

During HAFS v2.0 operational implementation NCO asked the team to resolve all compiler warnings. The "insertIntersect" function in sorc/fre-nctools.fd/shared_lib/create_xgrid.c is declared implicitly and it raises the
compiler warning. In this pull request, the prototype of "insertIntersect" function is added in create_xgrid.c to fix the compiler warning.

TESTS CONDUCTED:

The proposed change was tested in the HAFS system. No other tests were conducted.
Need assistance to conduct the following tests.

• Compile branch on all Tier 1 machines using Intel (Orion, Jet, Hera, Hercules and WCOSS2).
• Compile branch on Hera using GNU.
• Compile branch in 'Debug' mode on WCOSS2.
• Run unit tests locally on any Tier 1 machine.
• Run relevant consistency tests locally on all Tier 1 machines.

Optional test.

• Run full set of chgres_cube consistency tests on Hera.

Describe any additional tests performed.

DEPENDENCIES:

N/A

DOCUMENTATION:

If this PR is contributing new capabilities that need to be documented, please also include updates to the RST files in the docs/source directory as supporting material.

ISSUE:

If this PR is resolving or referencing one or more issues, in this repository or elsewhere, list them here. For example, "Fixes issue mentioned in #123" or "Related to bug in https://github.com/NOAA-EMC/other_repository/pull/63"

[GeorgeGayno-NOAA]

@BijuThomas-NOAA - On what machine(s) do you see the warning? Does the warning happen with the 'Release' or 'Debug' compiles?

[BijuThomas-NOAA]

@BijuThomas-NOAA - On what machine(s) do you see the warning? Does the warning happen with the 'Release' or 'Debug' compiles?

On WCOSS2, build type is Release

/lfs/h2/emc/hur/noscrub/biju.thomas/save/hafsv1p1a_2023rt/sorc/hafs_utils.fd/sorc/fre-nctools.fd/shared_lib/create_xgrid.c(1602): warnin
g #266: function "insertIntersect" declared implicitly            insertIntersect(grid1List, intersect[0], intersect[1], intersect[2], 0.0, u2, inbound, p1_1[0], p1_1[1], p1_1[2]);

[GeorgeGayno-NOAA]

@BijuThomas-NOAA - I compiled 2323761 on Cactus in both 'Release' and 'Debug' mode. I did not see that warning. The only warnings I see concern libjpeg, which I don't know how to fix.

[BijuThomas-NOAA]

The warning can be reproduced on Cactus in UFS_UTILS submodule (based on 6dee392 I think) in the HAFS production branch once the prototype is removed:

/lfs/h2/emc/hur/noscrub/biju.thomas/save/hafs_prod.v2/sorc/utils_build.log

/lfs/h2/emc/hur/noscrub/biju.thomas/save/hafs_prod.v2/sorc/hafs_utils.fd/sorc/fre-nctools.fd/shared_lib/create_xgrid.c(1602): warning #266: function "insertIntersect" declared implicitly
            insertIntersect(grid1List, intersect[0], intersect[1], intersect[2], 0.0, u2, inbound, p1_1[0], p1_1[1], p1_1[2]);
            ^                                                                                        
                                                                                                     
/lfs/h2/emc/hur/noscrub/biju.thomas/save/hafs_prod.v2/sorc/hafs_utils.fd/sorc/fre-nctools.fd/shared_lib/create_xgrid.c(1605): warning #266: function "insertIntersect" declared implicitly
            insertIntersect(grid1List, intersect[0], intersect[1], intersect[2], u1, u2, inbound, p1_0[0], p1_0[1], p1_0[2]);
            ^                                                                                        
                                                                                                     
/lfs/h2/emc/hur/noscrub/biju.thomas/save/hafs_prod.v2/sorc/hafs_utils.fd/sorc/fre-nctools.fd/shared_lib/create_xgrid.c(1619): warning #266: function "insertIntersect" declared implicitly
            insertIntersect(grid2List, intersect[0], intersect[1], intersect[2], 0.0, u1, 0, p2_1[0], p2_1[1], p2_1[2]);
            ^                                                                                        
                                                                                                     
/lfs/h2/emc/hur/noscrub/biju.thomas/save/hafs_prod.v2/sorc/hafs_utils.fd/sorc/fre-nctools.fd/shared_lib/create_xgrid.c(1621): warning #266: function "insertIntersect" declared implicitly
            insertIntersect(grid2List, intersect[0], intersect[1], intersect[2], u2, u1, 0, p2_0[0], p2_0[1], p2_0[2]);