Ignore unknown pragmas.

Be less verbose when allocating uprocs.
Don't drop core dump turds all over the place when x11 goes away.

src/lib9/_p9proc.c

@@ -54,7 +54,7 @@ _p9uproc(int inhandler)
 	while((up = mallocz(sizeof(Uproc), 1)) == nil)
 		sleep(1000);
 
-fprint(2, "alloc uproc for pid %d\n", pid);
+//fprint(2, "alloc uproc for pid %d\n", pid);
 	up->pid = pid;
 	lock(&uproclock);
 	h = pid%PIDHASH;