puzzles: fix star drawing in Signpost

- change point ordering to make concave polygon rendering work
- also enables an "Easter egg" of sorts

Change-Id: I3b4044a374dce1cff889d5f3744de9e634978591

apps/plugins/puzzles/rbwrappers.c

@@ -12,6 +12,8 @@ int sprintf_wrapper(char *str, const char *fmt, ...)
 
 char *getenv_wrapper(const char *c)
 {
+    if(!strcmp(c, "SIGNPOST_GEARS"))
+        return "y";
     return NULL;
 }