Fix GNU compiler warnings

[dpsarmie]

Description
This PR will bring in changes that will fix the compiler warning bugs that were occurring with the GNU compiler. The warnings were all of the same type. Comments have been added above the #if or #endif statements that previously had trailing text.

The comment format can be changed, but I'll leave that up to the CMs.

Fixes #411

How Has This Been Tested?
These changes were testing using the UFS Weather Model regression test system. No baseline changes were generated.

Checklist:

Please check all whether they apply or not

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[JosephMouallem]

Looks good to me, thanks.

[gspetro-NOAA]

This PR can be merged. Testing completed successfully for ufs-community/ufs-weather-model#3196.

[gspetro-NOAA]

@vithikashah001 Could you merge this PR?