macOS: Silence some deprecation warnings

modules/juce_gui_basics/native/juce_mac_FileChooser.mm

@@ -224,7 +224,9 @@ private:
             if (@available (macOS 10.9, *))
                 return NSModalResponseOK;
 
+            JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-declarations")
             return NSFileHandlingPanelOKButton;
+            JUCE_END_IGNORE_WARNINGS_GCC_LIKE
         }();
 
         if (panel != nil && result == okResult)

modules/juce_gui_basics/native/juce_mac_NSViewComponentPeer.mm

@@ -857,7 +857,9 @@ public:
             if (@available (macOS 10.10, *))
                 return (CGContextRef) [[NSGraphicsContext currentContext] CGContext];
 
+            JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-declarations")
             return (CGContextRef) [[NSGraphicsContext currentContext] graphicsPort];
+            JUCE_END_IGNORE_WARNINGS_GCC_LIKE
         }();
 
         if (! component.isOpaque())

modules/juce_gui_basics/native/juce_mac_Windowing.mm

@@ -645,11 +645,16 @@ static void selectImageForDrawing (const Image& image)
     [NSGraphicsContext saveGraphicsState];
 
     if (@available (macOS 10.10, *))
+    {
         [NSGraphicsContext setCurrentContext: [NSGraphicsContext graphicsContextWithCGContext: juce_getImageContext (image)
                                                                                       flipped: false]];
-    else
-        [NSGraphicsContext setCurrentContext: [NSGraphicsContext graphicsContextWithGraphicsPort: juce_getImageContext (image)
-                                                                                         flipped: false]];
+        return;
+    }
+
+    JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-declarations")
+    [NSGraphicsContext setCurrentContext: [NSGraphicsContext graphicsContextWithGraphicsPort: juce_getImageContext (image)
+                                                                                     flipped: false]];
+    JUCE_END_IGNORE_WARNINGS_GCC_LIKE
 }
 
 static void releaseImageAfterDrawing()