Fix #1563807: _ctypes built on AIX fails with ld ffi error.

The contents of ffi_darwin.c must be compiled unless __APPLE__ is
defined and __ppc__ is not.

Will backport.
diff --git a/Misc/NEWS b/Misc/NEWS
index a0403de..b2fbe7f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -101,6 +101,8 @@
 Library
 -------
 
+- Bug #1563807: _ctypes built on AIX fails with ld ffi error.
+
 - Bug #1598620: A ctypes Structure cannot contain itself.
 
 - Patch #1362975: Rework CodeContext indentation algorithm to