Merge pull request python-pillow#746 from cgohlke/patch-1

Fix build failure when compiler.include_dirs refers to nonexistent directory

setup.py

@@ -405,7 +405,12 @@ def build_extensions(self):
 
             # Find the best version
             for directory in self.compiler.include_dirs:
-                for name in os.listdir(directory):
+                try:
+                    listdir = os.listdir(directory)
+                except Exception:  
+                    # WindowsError, FileNotFoundError
+                    continue
+                for name in listdir:
                     if name.startswith('openjpeg-') and \
                         os.path.isfile(os.path.join(directory, name,
                                                     'openjpeg.h')):