Fix spell check on OSX

osx/hexchat.bundle

@@ -20,6 +20,13 @@
     ${prefix}/lib/hexchat/plugins/*.so
   </binary>
 
+  <binary>
+    ${prefix}/lib/libenchant.dylib
+  </binary>
+  <data>
+    ${prefix}/share/myspell/dicts
+  </data>
+
   <binary dest="${bundle}/Contents/MacOS">
     ${prefix}/bin/python
   </binary>