Revert "Revert "Remove __sinit and __sdidinit.""

This reverts commit c8bae05f3f.

We were breaking init (ueventd) because we initialize system properties
before we initialize stdio. The new system property implementation uses
stdio to read from /property_contexts, so we end up touching stdio data
structures before they've been initialized.

This second attempt takes things further by removing the stdio initialization
function altogether. The data structures for stdin/stdout/stderr can be
statically initialized as data, and -- since we already had to give the
atexit implementation a backdoor for stdio -- we can just admit that we
need to clean up stdio, and that we always do so last.

This patch also removes the 17 statically pre-allocated file structures,
so the first fopen will now allocate a block of 10 (the usual overflow
behavior). I did this just to make my life simpler, but it's not actually
necessary to remove it if we want it back.

Change-Id: I936b2eb5e88e4ebaf5516121872b71fc88e5609c

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__)