Fixing 132430 -- RealJukeBox breaks the plugin finder service, r=peterl, sr=attinasi

modules/plugin/samples/default/windows/npnul32.def

@@ -1,6 +1,7 @@
 LIBRARY   NPNUL32
 
 EXPORTS
-	NP_GetEntryPoints   @1
-	NP_Initialize       @2
-	NP_Shutdown         @3
+  NP_GetEntryPoints     @1
+  NP_Initialize         @2
+  NP_Shutdown           @3
+  NP_GetMIMEDescription @4

modules/plugin/samples/default/windows/npwin.cpp

@@ -42,6 +42,8 @@
 #include "npupp.h"
 #endif
 
+#include "nsDefaultPlugin.h"
+
 //\\// DEFINE
 #define NP_EXPORT
 
@@ -166,6 +168,12 @@ NP_Shutdown()
     return NPERR_NO_ERROR;
 }
 
+char * NP_GetMIMEDescription()
+{
+  static char mimetype[] = NS_PLUGIN_DEFAULT_MIME_DESCRIPTION;
+  return mimetype;
+}
+
 //						END - PLUGIN DLL entry points   
 ////\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//.
 //\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\.