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, 15 insertions, 0 deletions

diff --git a/sysutils/screen49/files/patch-termcap.c b/sysutils/screen49/files/patch-termcap.c
new file mode 100644
index 000000000000..cbe7a90f11a2
--- /dev/null
+++ b/sysutils/screen49/files/patch-termcap.c
@@ -0,0 +1,15 @@
+--- termcap.c.orig	2020-02-05 12:09:38.000000000 -0800
++++ termcap.c	2020-02-11 20:10:12.747990000 -0800
+@@ -361,11 +361,7 @@
+   if (D_CG0)
+     {
+       if (D_CS0 == 0)
+-#ifdef TERMINFO
+-        D_CS0 = "\033(%p1%c";
+-#else
+-        D_CS0 = "\033(%.";
+-#endif
++	D_CS0 = "\033(%p1%c"; /* Old ncurses can't handle %. */
+       if (D_CE0 == 0)
+         D_CE0 = "\033(B";
+       D_AC = 0;