Update ChangeLog.

doc/ChangeLog

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+===============================================================
+
+Tag name:
+Originator(s): nusbaume
+Date: Oct 2, 2024
+One-line Summary: Bring in re-organized atmospheric_physics repo
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1160
+
+Purpose of changes (include the issue number and title text for each relevant
+GitHub issue):
+
+Fixes #1156 -> Modify CAM build system to handle re-organized
+atmospheric_physics repo
+
+Describe any changes made to build system:
+
+Updated the 'configure' script to use the new atmospheric_physics directory
+locations
+
+Describe any changes made to the namelist: N/A
+
+List any changes to the defaults for the boundary datasets: N/A
+
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by:
+
+List all files eliminated: N/A
+
+List all files added and what they do: N/A
+
+List all existing files that have been modified, and describe the changes:
+M       .gitmodules
+ - Update the atmos_phys external
+
+M       bld/configure
+ - Update atmos_phys paths to correctly point to new source code locations
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below.  All failed tests must be justified.
+
+derecho/intel/aux_cam:
+
+derecho/nvhpc/aux_cam:
+
+izumi/nag/aux_cam:
+
+izumi/gnu/aux_cam: ALL PASS
+
+Summarize any changes to answers: bit-for-bit
+
+===============================================================
+
 Tag name: cam6_4_037
 Originator(s): jimmielin
 Date: Sep 30, 2024