Enabled use of libedit as alternative to libreadline

configure.ac

@@ -144,8 +144,24 @@ dnl The X= in the yes case prevents that -lreadline gets linked twice
 else
     READLINE_DEF=
 fi
+if test x$READLINE_DEF = x; then
+    AC_ARG_ENABLE(libedit,
+    [  --enable-libedit    Enable use of libedit by xorriso if not libreadline, default=yes],
+                   , enable_libedit=yes)
+    if test x$enable_libedit = xyes; then
+dnl Check whether there is development and runtime support.
+dnl If not, erase this macro which would enable use of el_*(), history*()
+        READLINE_DEF="-DXorriso_with_editlinE"
+
+        LIBBURNIA_ASSERT_EDITLINE
+
+    else
+        READLINE_DEF=
+    fi
+fi
 AC_SUBST(READLINE_DEF)
 
+
 dnl ts A90329
 dnl ACL and xattr do not need to be enabled in libisoburn or xorriso source
 dnl but without AC_CHECK_LIB() xorriso will not be linked with -lacl .