More header fixups
Import https://gitorious.org/0xdroid/bionic/raw/30a419afc3cdb641e350c7cfde753877675958e0:libc/string/index.c
Export index, and strrchr
Import https://gitorious.org/0xdroid/bionic/raw/30a419afc3cdb641e350c7cfde753877675958e0:libc/string/strspn.c
Import https://gitorious.org/0xdroid/bionic/raw/30a419afc3cdb641e350c7cfde753877675958e0:libc/string/strtok.c, define strspn
Export strtok
Move memcpy into string, since it belongs there, anyway...
Update MakeFile
Import https://gitorious.org/0xdroid/bionic/raw/30a419afc3cdb641e350c7cfde753877675958e0:libc/string/strxfrm.c
Update MakeFile, export strxfrm
Import https://gitorious.org/0xdroid/bionic/raw/30a419afc3cdb641e350c7cfde753877675958e0:libc/string/strdup.c
strdup...
str(l)cat
strchr, memcmp
strchr, memcmp
Tidy up