Export "PyInit___init__" and "init__init__" as additional module init...

Export "PyInit___init__" and "init__init__" as additional module init functions under Windows to make compiled packages work.

Cython/Compiler/ModuleNode.py

@@ -2297,9 +2297,18 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
         code.putln("#if PY_MAJOR_VERSION < 3")
         # Optimise for small code size as the module init function is only executed once.
         code.putln("%s CYTHON_SMALL_CODE; /*proto*/" % header2)
+        if self.scope.is_package:
+            code.putln("#if !defined(CYTHON_NO_PYINIT_EXPORT) && (defined(WIN32) || defined(MS_WINDOWS))")
+            code.putln("__Pyx_PyMODINIT_FUNC init__init__(void) { init%s(); };" % env.module_name)
+            code.putln("#endif")
         code.putln(header2)
         code.putln("#else")
         code.putln("%s CYTHON_SMALL_CODE; /*proto*/" % header3)
+        if self.scope.is_package:
+            code.putln("#if !defined(CYTHON_NO_PYINIT_EXPORT) && (defined(WIN32) || defined(MS_WINDOWS))")
+            code.putln("__Pyx_PyMODINIT_FUNC PyInit___init__(void) { return %s(); };" % (
+                self.mod_init_func_cname('PyInit', env)))
+            code.putln("#endif")
         code.putln(header3)
 
         # CPython 3.5+ supports multi-phase module initialisation (gives access to __spec__, __file__, etc.)