Issue #27310: Fix IDLE.app failure to launch on OS X due to vestigial import.

Mac/IDLE/IDLE.app/Contents/Resources/idlemain.py

@@ -68,8 +68,6 @@ for idx, value in enumerate(sys.argv):
         break
 
 # Now it is safe to import idlelib.
-from idlelib import macosxSupport
-macosxSupport._appbundle = True
 from idlelib.pyshell import main
 if __name__ == '__main__':
     main()

Misc/NEWS

@@ -2,6 +2,17 @@
 Python News
 +++++++++++
 
+What's New in Python 3.6.0 alpha 3
+==================================
+
+*Release date: XXXX-XX-XX*
+
+IDLE
+++++
+
+- Issue #27310: Fix IDLE.app failure to launch on OS X due to vestigial import.
+
+
 What's New in Python 3.6.0 alpha 2
 ==================================