Retain the apple configuration distinguisher during host and exec transitions.

Part of work on execution transitions, #7935.

PiperOrigin-RevId: 250485307
diff --git a/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java b/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java
index 57c8cf9..e6c2aa5 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/apple/AppleCommandLineOptions.java
@@ -441,6 +441,8 @@
     // be needed.
     host.applePlatformType = PlatformType.MACOS;
 
+    host.configurationDistinguisher = configurationDistinguisher;
+
     return host;
   }