Allow the shared library initialization routine to be overridden with an initialize=xxx argument.

Should fix #492465.
diff --git a/Mac/Lib/mkcwproject/cwxmlgen.py b/Mac/Lib/mkcwproject/cwxmlgen.py
index e80cfa7..0ffe12f 100644
--- a/Mac/Lib/mkcwproject/cwxmlgen.py
+++ b/Mac/Lib/mkcwproject/cwxmlgen.py
@@ -53,6 +53,8 @@
 			dict['stdlibraryflags'] = 'Debug'
 		if not dict.has_key('libraryflags'):
 			dict['libraryflags'] = 'Debug'
+		if not dict.has_key('initialize'):
+			dict['initialize'] = '__initialize'
 		if not dict.has_key('mac_sysprefixtype'):
 			if os.path.isabs(dict['sysprefix']):
 				dict['mac_sysprefixtype'] = 'Absolute'