Bug#23097 mysql can't insert korean on mysql prompt.

Problem: libedit is a very pure-ASCII oriented library,
and it is not aware of extended (0x80..0xFF) or even multi-byte
characters. It considered such characters as non-printable
and didn't allow to input them.
Fix: make libedit think that all bytes >= 0x80 are printable.

cmd-line-utils/libedit/el.h

@@ -136,6 +136,8 @@ struct editline {
 
 protected int	el_editmode(EditLine *, int, const char **);
 
+#define el_isprint(x)  ((unsigned char) (x) < 0x80 ? isprint(x) : 1)
+
 #ifdef DEBUG
 #define	EL_ABORT(a)	do { \
 				fprintf(el->el_errfile, "%s, %d: ", \