* libc/stdio/Makefile.am: Build vfprintf.c and vfscanf.c with
-DSTRING_ONLY defined with and without -DINTEGER_ONLY defined
to build special versions for sprintf/sscanf family functions.
* libc/stdio/Makefile.in: Regenerated.
* libc/stdio/vfprintf.c[STRING_ONLY][INTEGER_ONLY](_VFPRINTF_R):
Redefine to be _svfiprintf_r which is optimized to work with siprintf
family of functions (i.e. no I/O) and does not support floating-point.
[STRING_ONLY][!INTEGER_ONLY](_VFPRINTF_R): Redefine to be
_svfprintf_r which is optimized to work with sprintf family of
functions and not use I/O.
[STRING_ONLY](__sprint_r): New string only version of static function.
designed to work with sprintf family of functions.
* libc/stdio/vfscanf.c[STRING_ONLY][INTEGER_ONLY](_SVFSCANF_R):
Redefine to be _ssvfiscanf_r which is optimized to work with siscanf
family of functions (i.e. no I/O) and no float-point support.
[STRING_ONLY][!INTEGER_ONLY](_SVFSCANF_R): Redefine to be
__ssvfscanf_r which is optimized to work with sscanf family of
functions and does not require I/O functions.
* libc/stdio/asprintf.c: Call _svfprintf_r instead of _vfprintf_r.
* libc/stdio/snprintf.c: Ditto.
* libc/stdio/sprintf.c: Ditto.
* libc/stdio/vasnprintf.c: Ditto.
* libc/stdio/vasprintf.c: Ditto.
* libc/stdio/siprintf.c: Call _svfiprintf_r instead of _vfiprintf_r.
* libc/stdio/sniprintf.c: Ditto.
* libc/stdio/vasiprintf.c: Ditto.
* libc/stdio/vsiprintf.c: Ditto.
* libc/stdio/vsniprintf.c: Ditto.
* libc/stdio/vsprintf.c: Ditto.
* libc/stdio/local.h: Add prototypes for _svfprintf_r, _svfiprintf_r,
_ssvfscanf_r, and _ssvfiscanf_r.
* libc/stdio/sscanf.c: Call _ssvfscanf_r instead of _svfscanf_r.
* libc/stdio/vsscanf.c: Ditto.
* libc/stdio/siscanf.c: Call _ssvfiscanf_r instead of _svfiscanf_r.
* libc/stdio/vsiscanf.c: Ditto.
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