[Minor] Avoid nested opening comment sequences

../contrib/libev/ev.c: At top level:
../contrib/libev/ev.c:5660:27: warning: "/*" within comment [-Wcomment]
 5660 | /* EV_STAT     0x00001000 /* stat data changed */
      |
../contrib/libev/ev.c:5661:27: warning: "/*" within comment [-Wcomment]
 5661 | /* EV_EMBED    0x00010000 /* embedded event loop needs sweep */
      |

contrib/libev/ev.c

@@ -5652,8 +5652,8 @@ ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_NOEXCEPT
           wl = wn;
         }
 #endif
-/* EV_STAT     0x00001000 /* stat data changed */
-/* EV_EMBED    0x00010000 /* embedded event loop needs sweep */
+// EV_STAT     0x00001000 /* stat data changed */
+// EV_EMBED    0x00010000 /* embedded event loop needs sweep */
 }
 #endif
 void