Ports: Add editline library (#2532)

Ports/editline/package.sh

@@ -0,0 +1,6 @@
+#!/bin/bash ../.port_include.sh
+port=editline
+version=1.17.1
+useconfigure=true
+files="https://github.com/troglobit/editline/releases/download/${version}/editline-${version}.tar.xz editline-${version}.tar.xz ec25530e02f0926909bd0f176528019e"
+auth_type="md5"

Ports/editline/patches/configure-system.patch

@@ -0,0 +1,11 @@
+--- editline-1.17.1/aux/config.sub	2020-06-08 23:59:28.865434416 +1000
++++ editline-1.17.1/aux/config.sub.new	2020-06-08 23:59:21.345434106 +1000
+@@ -1390,7 +1390,7 @@
+ 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
+ 	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* \
+ 	      | -onefs* | -tirtos* | -phoenix* | -fuchsia* | -redox* | -bme* \
+-	      | -midnightbsd*)
++	      | -midnightbsd* | -serenity*)
+ 	# Remember, each alternative MUST END IN *, to match a version number.
+ 		;;
+ 	-qnx*)

Ports/editline/patches/example-add-missing-header.patch

@@ -0,0 +1,10 @@
+--- editline-1.17.1/examples/excallback.c	2020-02-23 19:37:53.000000000 +1100
++++ editline-1.17.1/examples/excallback.c.new	2020-06-09 00:29:06.482173883 +1000
+@@ -39,6 +39,7 @@
+ 
+ #include <stdio.h>
+ #include <sys/types.h>
++#include <sys/select.h>
+ 
+ #ifdef HAVE_STDLIB_H
+ #include <stdlib.h>