* iconvdata/Makefile (modules): Add ISO-2022-CN.
Add link rules for this module.
(distribute): Add iso-2022-cn.c and cns11643l2.h.
* iconvdata/cns11643l2.h: New file.
* iconvdata/iso-2022-cn.c: New file.
* iconvdata/gconv-modules: Add entries for ISO-2022-CN module.
* iconvdata/cns11643l1.h (cns11643l1_to_ucs4): Make string argument
unsigned.
(ucs4_to_cns11643l1): Likewise.
* iconvdata/euc-tw.c: Correct parameter passed to cns11643l1_to_ucs4.
* iconvdata/iso-2022-kr.c: Remove unnecessary test from conversion
loop to UCS4.
Optimize recognition of escape sequences a bit.
