ecore_cocoa: add missing header from my old branch

src/lib/ecore_cocoa/ecore_cocoa_window.h

@@ -0,0 +1,14 @@
+#import <Cocoa/Cocoa.h>
+
+@interface EcoreCocoaWindow: NSWindow <NSWindowDelegate>
+{
+	void *ecore_window_data;
+}
+
+@property (nonatomic, assign) void *ecore_window_data;
+
+- (id) initWithContentRect: (NSRect) contentRect
+                 styleMask: (unsigned int) aStyle
+                   backing: (NSBackingStoreType) bufferingType
+                     defer: (BOOL) flag;
+@end