sysutils/screen*: Rename screen and introduce a meta port

This is in preparation for the import of screen 5.0.0. I've tried
screen-devel (5.0.0 prelrelease). There were some bugs and
inconsistencies with screen 4.9.1. So we move screen to screen49
to maintain a version of screen that is known to work.

This implements the concept of a master screen port by renaming it to
screen49 and creating a slave port called screen.  The idea of this is
similar in concept used with the cfengine or krb5 family of ports.
Users should never need to change port origins when a new stable
version of screen is committed.

People can install the screen port or package as before. However if they
choose to use the other screen port/package they may remove screen and
install the versioned "master" port/package directly.

This is in preparation for import of screen 5.0.0 into the ports
collection. Unfortunately my initial testing of screen 5.0.0 using the
screen-devel port uncovered an annoying (to me) bug, which I have opened
an issue with our upstream. I have not found the time to test their
patches enough to feel comfortalbe replacing the existing screen 4.9.1
with 5.0.0. When 5.0.0 will be imported as sysutils/screen50, it will
not become the default master port until we believe it won't become
a source of many bugzilla bugs.

1 files changed, 8 insertions, 0 deletions

diff --git a/sysutils/screen49/files/patch-extern.h b/sysutils/screen49/files/patch-extern.h
new file mode 100644
index 000000000000..99e9063cdd0f
--- /dev/null
+++ b/sysutils/screen49/files/patch-extern.h
@@ -0,0 +1,8 @@
+--- extern.h.orig	2023-08-15 08:44:47 UTC
++++ extern.h
+@@ -512,3 +512,5 @@
+ /* layout.c */
+ extern void  RemoveLayout __P((struct layout *));
+ extern int   LayoutDumpCanvas __P((struct canvas *, char *));
++
++extern time_t SessionCreationTime __P((const char *));