Build _scproxy for Mac

This is required for the urllib module.

Test: py2-cmd -murllib
Change-Id: Ifaa4e92e5c95b86fbf9eb397d4b4929db77de3a1
diff --git a/Modules/config.c b/Modules/config.c
index 677c063..2255347 100644
--- a/Modules/config.c
+++ b/Modules/config.c
@@ -81,6 +81,9 @@
 extern void init_sqlite3(void);
 extern void init_ctypes(void);
 extern void init_ctypes_test(void);
+#ifdef __APPLE__
+extern void init_scproxy(void);
+#endif
 
 /* -- ADDMODULE MARKER 1 -- */
 
@@ -150,6 +153,9 @@
     {"_sqlite3", init_sqlite3},
     {"_ctypes", init_ctypes},
     {"_ctypes_test", init_ctypes_test},
+#ifdef __APPLE__
+    {"_scproxy", init_scproxy},
+#endif
 
 /* -- ADDMODULE MARKER 2 -- */