LWP failed to wake up threads sleeping in empth_sleep() while other

threads were runnable.  This let players with a sufficiently fast
connection starve out system threads, including the update.  Fix:
[EMPTH_LWP] (lwpWakeupSleep): External linkage.
[EMPTH_LWP] (lwpReschedule): Call it.

src/lib/lwp/lwp.c

@@ -76,6 +76,7 @@ lwpReschedule(void)
     }
 
     lwpSigWakeup();
+    lwpWakeupSleep();
 
     /* destroy dead threads */
     lwpStatus(LwpCurrent, "Cleaning dead queue");

src/lib/lwp/lwpint.h

@@ -89,6 +89,7 @@ void lwpReady(struct lwpProc *);
 void lwpReschedule(void);
 void lwpEntryPoint(void);
 void lwpInitSelect(struct lwpProc *);
+void lwpWakeupSleep(void);
 void lwpSelect(void *);
 void lwpInitSigWait(sigset_t *);
 void lwpSigWakeup(void);

src/lib/lwp/sel.c

@@ -123,7 +123,7 @@ lwpWakeupFd(struct lwpProc *proc)
     lwpReady(proc);
 }
 
-static void
+void
 lwpWakeupSleep(void)
 {
     time_t now;