SL-18837: Disable APR_LOG for now, but leave notes for the future.

.github/workflows/build.yaml

@@ -159,7 +159,8 @@ jobs:
           }
           export -f native_path shell_path finalize initialize_build initialize_version
           export -f python_cmd repo_branch record_dependencies_graph sleep
-          export APR_LOG="${RUNNER_TEMP}/apr.log"
+          ## Useful for diagnosing Windows LLProcess/LLLeap test failures
+          ##export APR_LOG="${RUNNER_TEMP}/apr.log"
           export arch=$(uname | cut -b-6)
           # Surprise! GH Windows runner's MINGW6 is a $arch value we've never
           # seen before, so numerous tests don't know about it.

indra/llcommon/tests/llprocess_test.cpp

@@ -158,6 +158,9 @@ struct PythonProcessLauncher
         }
         catch (const tut::failure&)
         {
+            // On Windows, if APR_LOG is set, our version of APR's
+            // apr_create_proc() logs to the specified file. If this test
+            // failed, try to report that log.
             const char* APR_LOG = getenv("APR_LOG");
             if (APR_LOG && *APR_LOG)
             {