Preliminary port of GNU screen

Compiles but doesn't work yet.

app-misc/screen/patches/screen-4.2.1_git.patchset

@@ -0,0 +1,56 @@
+From aebd5f2e4b57e6c1461b25c02496efb97c8b201c Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Fran=C3=A7ois=20Revol?= <revol@free.fr>
+Date: Fri, 20 Jun 2014 17:16:37 +0200
+Subject: [PATCH 1/2] Haiku port: Check for some libraries
+
+* libnetwork for sockets,
+* libbsd for getpass.
+---
+ src/configure.in | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/src/configure.in b/src/configure.in
+index 87fd43b..66f9cfb 100644
+--- a/src/configure.in
++++ b/src/configure.in
+@@ -1254,7 +1254,9 @@ AC_TRY_LINK([
+ #include <langinfo.h>
+ ],[nl_langinfo(CODESET);], AC_MSG_RESULT(yes);AC_DEFINE(HAVE_NL_LANGINFO), AC_MSG_RESULT(no))
+ 
+-AC_SEARCH_LIBS(gethostname, nsl)
++AC_SEARCH_LIBS(gethostname, nsl network)
++
++AC_CHECK_LIB(bsd, getpass)
+ 
+ AC_CHECK_FUNCS(rename fchmod fchown strerror lstat _exit utimes vsnprintf getcwd setlocale strftime)
+ 
+-- 
+1.8.3.4
+
+From 90ac531362b5455424fdebcc9e60576b220f2dde Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Fran=C3=A7ois=20Revol?= <revol@free.fr>
+Date: Fri, 20 Jun 2014 17:18:32 +0200
+Subject: [PATCH 2/2] Haiku port: temporary workaround for missing utmp
+
+---
+ src/acconfig.h | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/src/acconfig.h b/src/acconfig.h
+index 2e46985..e5e828b 100644
+--- a/src/acconfig.h
++++ b/src/acconfig.h
+@@ -191,7 +191,9 @@
+  * If screen is installed with permissions to update /etc/utmp (such
+  * as if it is installed set-uid root), define UTMPOK.
+  */
+-#define UTMPOK
++#ifndef __HAIKU__
++# define UTMPOK
++#endif
+ 
+ /* Set LOGINDEFAULT to one (1)
+  * if you want entries added to /etc/utmp by default, else set it to
+-- 
+1.8.3.4
+