wine-preloader: change usage message to reflect that it is only for internal usage

[Austin English]

-- 
-Austin
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diff --git a/loader/preloader.c b/loader/preloader.c
index 2dc2872..1a87e44 100644
--- a/loader/preloader.c
+++ b/loader/preloader.c
@@ -1051,7 +1051,7 @@ void* wld_start( void **stack )
 
     pargc = *stack;
     argv = (char **)pargc + 1;
-    if (*pargc < 2) fatal_error( "Usage: %s wine_binary [args]\n", argv[0] );
+    if (*pargc < 2) fatal_error( "%s is only meant for internal Wine usage\n", argv[0] );
 
     /* skip over the parameters */
     p = argv + *pargc + 1;