Remove __sinit and __sdidinit.

We're eagerly initializing stdio now, so this can all be simplified.

Change-Id: Icb288f8dd0ee08f02bea0d23670f75e78bed6b99

libc/stdio/refill.c

@@ -51,11 +51,6 @@ lflush(FILE *fp)
 int
 __srefill(FILE *fp)
 {
-
-	/* make sure stdio is set up */
-	if (!__sdidinit)
-		__sinit();
-
 	fp->_r = 0;		/* largely a convenience for callers */
 
 #if !defined(__ANDROID__)