bpo-42362: Switch to clang/clang++ as the default compiler in build-installer.py (GH-23298)



This change is cosmetic only, the "gcc" command in Apple's compiler tools is an alias for "clang" (and using non-system tooling for building the installer is not supported by this script).

Automerge-Triggered-By: GH:ned-deily
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index 15a45b9..540b5a0 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -161,8 +161,11 @@ def getTargetCompilers():
         '10.4': ('gcc-4.0', 'g++-4.0'),
         '10.5': ('gcc', 'g++'),
         '10.6': ('gcc', 'g++'),
+        '10.7': ('gcc', 'g++'),
+        '10.8': ('gcc', 'g++'),
+        '10.9': ('gcc', 'g++'),
     }
-    return target_cc_map.get(DEPTARGET, ('gcc', 'g++') )
+    return target_cc_map.get(DEPTARGET, ('clang', 'clang++') )
 
 CC, CXX = getTargetCompilers()