Add support for libvips compiled with OpenJPEG

lib/constructor.js

@@ -235,6 +235,11 @@ const Sharp = function (input, options) {
     pngQuality: 100,
     pngBitdepth: 8,
     pngDither: 1,
+    jp2Quality: 80,
+    jp2TileHeight: 512,
+    jp2TileWidth: 512,
+    jp2Lossless: false,
+    jp2ChromaSubsampling: '4:4:4',
     webpQuality: 80,
     webpAlphaQuality: 100,
     webpLossless: false,