Fix to ensure that define is interpreted as a string on windows

PIL/Image.py

@@ -56,7 +56,10 @@ def __getattr__(self, id):
     from . import _imaging as core
     if PILLOW_VERSION != getattr(core, 'PILLOW_VERSION', None):
         raise ImportError("The _imaging extension was built for another "
-                          "version of Pillow or PIL")
+                          "version of Pillow or PIL: Core Version: %s"
+                          "Pillow Version:  %s" %
+                          (getattr(core, 'PILLOW_VERSION', None),
+                           PILLOW_VERSION))
 
 except ImportError as v:
     core = _imaging_not_installed()

_imaging.c

@@ -3435,6 +3435,7 @@ static PyMethodDef functions[] = {
 static int
 setup_module(PyObject* m) {
     PyObject* d = PyModule_GetDict(m);
+    const char* version = (char*)PILLOW_VERSION;
 
     /* Ready object types */
     if (PyType_Ready(&Imaging_Type) < 0)
@@ -3479,7 +3480,7 @@ setup_module(PyObject* m) {
   }
 #endif
 
-    PyDict_SetItemString(d, "PILLOW_VERSION", PyUnicode_FromString(PILLOW_VERSION));
+    PyDict_SetItemString(d, "PILLOW_VERSION", PyUnicode_FromString(version));
 
     return 0;
 }

setup.py

@@ -584,7 +584,10 @@ def build_extensions(self):
         if struct.unpack("h", "\0\1".encode('ascii'))[0] == 1:
             defs.append(("WORDS_BIGENDIAN", None))
 
-        defs.append(("PILLOW_VERSION", '"%s"'%PILLOW_VERSION))
+        if sys.platform == "win32":
+            defs.append(("PILLOW_VERSION", '"\\"%s\\""'%PILLOW_VERSION))
+        else:
+            defs.append(("PILLOW_VERSION", '"%s"'%PILLOW_VERSION))
 
         exts = [(Extension("PIL._imaging",
                            files,