screen: fix gcc-14 build

add missing pty.h header
upstream master has already incorporated this patch

packages/addons/addon-depends/system-tools-depends/screen/patches/screen-01_fix_gcc-14_build.patch

@@ -0,0 +1,12 @@
+diff --git a/pty.c b/pty.c
+index 6791fd5..9ef1471 100644
+--- a/pty.c
++++ b/pty.c
+@@ -30,6 +30,7 @@
+ #include <sys/stat.h>
+ #include <fcntl.h>
+ #include <signal.h>
++#include <pty.h>
+ 
+ #if defined(__OpenBSD__)
+ #include <utils.h>  /* for openpty() */