This is to simplify maintaining charsets, especially changing
CHARSET_INFO structure.


acconfig.h:
  New defines for charsets
configure.in:
  New way to build charsets
include/m_ctype.h:
  Prototypes, moved from ctype_autoconf.c
libmysql/Makefile.shared:
  Removed ctype_autoconf.c and ctype_extra_sources.c from target dependancies
strings/Makefile.am:
  The same with above
strings/conf_to_src.c:
  Remove unnecessary comment
strings/ctype-czech.c:
   Fix for possible bugs that prototypes was not included
strings/ctype-euc_kr.c:
   Fix for possible bugs that prototypes was not included
strings/ctype-gb2312.c:
   Fix for possible bugs that prototypes was not included
strings/ctype-ujis.c:
   Fix for possible bugs that prototypes was not included
strings/ctype.c:
  Move tables from ctype_extra_sources.c and hide them under #ifdefs