* libc/include/stdio.h (__SMOD): Remove definition of unused flag.

	* libc/include/stdio.h (__SMOD): Remove definition of unused flag.
	* libc/include/sys/reent.h (struct __sFILE): Add _flags2 member.
	* libc/stdio/findfp.c (std): Initialize _flags2.
	(__sfp): Ditto.
	* libc/stdio/refill.c (__srefill_r): Drop resetting __SMOD flag.
	* libc/stdio/vfscanf.c (__ssrefill_r): Ditto.
	* libc/stdio/fseek.c (_fseek_r): Drop checking __SMOD flag.
	* libc/stdio64/fseeko64.c (_fseeko64_r): Ditto.