Update ChangeLog with Izumi test results.

doc/ChangeLog

@@ -32,7 +32,7 @@ A       cime_config/testdefs/testmods_dirs/cam/outfrq9s_mpasa480_pertlim/user_nl
 List all existing files that have been modified, and describe the changes:
 
 M       src/dynamics/mpas/dyn_comp.F90
- - Allow initial state perturbations when reading from the ncdata file.
+ - Allow initial state perturbations with MPAS when reading from the ncdata file.
 
 M       cime_config/testdefs/testlist_cam.xml
  - Add new MPAS pertlim regression test files.
@@ -57,12 +57,14 @@ SMS_D_Ln9_P1280x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-ou
 
 derecho/nvhpc/aux_cam: ALL PASS
 
-izumi/nag/aux_cam:
+izumi/nag/aux_cam: ALL PASS
+
+izumi/gnu/aux_cam: ALL PASS
 
 CAM tag used for the baseline comparison tests if different than previous
 tag:
 
-Summarize any changes to answers:
+Summarize any changes to answers: b4b
 
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