Fix compile error statically linking build with DX9

panda/src/framework/pandaFramework.cxx

@@ -96,7 +96,7 @@ open_framework(int &argc, char **&argv) {
   extern EXPCL_PANDAGL void init_libpandagl();
   init_libpandagl();
   #elif defined(HAVE_DX9)
-  extern EXPCL_PANDADX9 void init_libpandadx9();
+  extern EXPCL_PANDADX void init_libpandadx9();
   init_libpandadx9();
   #elif defined(HAVE_TINYDISPLAY)
   extern EXPCL_TINYDISPLAY void init_libtinydisplay();