StdOut Unicode support, controlled by /OUTPUTCHARSET and/or existing BOM if redirected.

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@6350 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/Makensisw/makensisw.h

@@ -85,6 +85,12 @@ namespace MakensisAPI {
     NOTIFY_ERROR,
     NOTIFY_OUTPUT
   };
+  enum sndmsg_e {
+    QUERYHOST = WM_APP
+  };
+  enum QUERYHOST_e {
+    QH_OUTPUTCHARSET = 1
+  };
 }
 
 typedef enum {