Ignore unknown preprocessor directives in an #if group that is excluded.

git-svn-id: svn://svn.cc65.org/cc65/trunk@4534 b7a2c559-68d2-44c3-8de9-860c34a00d81

src/cc65/preproc.c

@@ -1361,13 +1361,17 @@ void Preprocess (void)
                                 DoWarning ();
                             }
                         } else {
+                            if (!Skip) {
                                 PPError ("Preprocessor directive expected");
+                            }
                             ClearLine ();
                         }
                         break;
 
     	    	    default: 
+                        if (!Skip) {
     	    	    	    PPError ("Preprocessor directive expected");
+                        }
     	    	    	ClearLine ();
     	    	}
     	    }