Don't check for readline, if shared lib or Windows GUI is selected

configure.ac

@@ -1252,9 +1252,13 @@ if test "x$enable_expdevices" = xyes; then
 fi
 
 #  ----  Option to include GNU readline support in ngspice CLI  ----
-#  ----  Default: disabled.                                     ----
+#  ----  Default: enabled.                                     ----
 #  ----  Hope to see in the future readline replacement.        ----
 
+if test "x$with_wingui" = xyes || test "x$with_ngshared" = xyes; then
+    AC_MSG_RESULT([GNU readline disabled.])
+    AC_MSG_RESULT([BSD editline disabled.])
+else
     if test "x$with_readline" = xno ; then
         AC_MSG_RESULT([GNU readline disabled.])
     else
@@ -1310,6 +1314,7 @@ else
             [AC_MSG_ERROR([Couldn't find editline libraries.])],
             [-lncurses])
     fi
+fi
 
 # Use AC_CHECK_HEADERS so the HAVE_*_H symbol gets defined
 AC_CHECK_HEADERS([ncurses/termcap.h termcap.h])