nsgenjsbind patch: correct prototype for spidermonkey < 180

[Ole]

Hello,

this patch declares the jsclass_mark function correctly for 
spidermonkey versions < 180.

Please apply, thanks.

Greets,
Olediff --git a/src/jsapi-libdom.c b/src/jsapi-libdom.c
index 41491c1..5c918de 100644
--- a/src/jsapi-libdom.c
+++ b/src/jsapi-libdom.c
@@ -383,7 +383,7 @@ output_jsclass(struct binding *binding)
 
        if (binding->mark != NULL) {
                fprintf(binding->outfile,
-                       "static JSBool jsclass_mark(JSTracer *trc, JSObject 
*obj);\n\n");
+                       "static JSAPI_MARKOP(jsclass_mark);\n\n");
        }
 
        if (binding->has_private || (binding->finalise != NULL)) {