Put struct FILE back how NDK-built apps expect it.

The first rule of stdio is you never change struct FILE. This broke all
NDK-built apps that used stdin/stdout/stderr. (Which is more than you
might think, given that those streams don't go anywhere useful. Svelte!)

I've added a big code comment because I knew when I removed the field that
doing so was a mistake, but I couldn't think why.

Bug: http://b/24807045
Bug: http://b/26747402
Change-Id: Ie1233586b223bb1cdf8e354c66d5ff23487a833a
diff --git a/libc/stdio/stdio.cpp b/libc/stdio/stdio.cpp
index 1066d7f..7e9c439 100644
--- a/libc/stdio/stdio.cpp
+++ b/libc/stdio/stdio.cpp
@@ -52,7 +52,7 @@
 
 #define	std(flags, file) \
 	{0,0,0,flags,file,{0,0},0,__sF+file,__sclose,__sread,__sseek,__swrite, \
-	    {(unsigned char *)(__sFext+file), 0},NULL,0,{0},{0},{0,0},0}
+	    {(unsigned char *)(__sFext+file), 0},NULL,0,{0},{0},{0,0},0,0}
 
 _THREAD_PRIVATE_MUTEX(__sfp_mutex);