* libc/string/Makefile.am: Add support for strsep.c.
* libc/string/Makefile.in: Regenerated.
* libc/string/strsep.c: New file.
* libc/string/strtok.c: Change to call __strtok_r service routine.
* libc/string/strtok_r.c: Add __strtok_r routine which takes
additional flag parameter regarding whether to skip leading delimeters.
Change strtok_r to call __strtok_r.
Jeff Johnston