Simplify fseek/ftell.

Another step towards _FILE_OFFSET_BITS=64 support.

Bug: http://b/24807045
Change-Id: I00b83c81a7b108176c4d9437bc32611f73b7e967
diff --git a/libc/stdio/local.h b/libc/stdio/local.h
index a15bddf..7188c74 100644
--- a/libc/stdio/local.h
+++ b/libc/stdio/local.h
@@ -92,7 +92,6 @@
 
 	/* Unix stdio files get aligned to block boundaries on fseek() */
 	int	_blksize;	/* stat.st_blksize (may be != _bf._size) */
-	fpos_t	_offset;	/* current lseek offset */
 };
 
 /*
@@ -112,6 +111,10 @@
   bool _caller_handles_locking;
 };
 
+// TODO: remove remaining references to these obsolete flags.
+#define __SNPT 0
+#define __SOPT 0
+
 #if defined(__cplusplus)
 #define _EXT(fp) reinterpret_cast<__sfileext*>((fp)->_ext._base)
 #else