Adjust to new event function default name in varnish-cache master

Ref d8ae26b5a0b4a1102360a61a145e4730e52d68bc

src/vmod_re2.c

@@ -225,7 +225,7 @@ rewritef(VRT_CTX, vre2 * restrict vre2, const rewrite_e mode, VCL_STRING text,
 /* Event function */
 
 int
-event(VRT_CTX, struct vmod_priv *priv, enum vcl_event_e e)
+vmod_event(VRT_CTX, struct vmod_priv *priv, enum vcl_event_e e)
 {
 	(void) ctx;
 	(void) priv;