* libc/include/stdlib.h: add declarations for
_strtoull_r, _strtoll_r, strtoull, and strtoll.
* libc/stdio/local.h: remove declarations of
__strtoull_r and __strtoll_r.
* libc/stdio/vfscanf.c(__svfscanf_r): call
_strtoull_r instead of __strtoull_r. Ditto
_strtoll_r vs. __strtoll_r.
* libc/stdlib/Makefile.am: add new files to
.c list and .def list
* libc/stdlib/Makefile.in: regenerate
* libc/stdlib/strtoll_r.c: rename __strtoll_r
as _strtoll_r
* libc/stdlib/strtoull_r.c: rename __strtoull_r
as _strtoull_r
* libc/stdlib/strtoull.c: new file
* libc/stdlib/strtoll.c: new file