Add missing patch

screen-4.2.1-crypt.patch

@@ -0,0 +1,13 @@
+diff --git a/misc.c b/misc.c
+index 43e93a2..178fda9 100644
+--- a/misc.c
++++ b/misc.c
+@@ -56,6 +56,8 @@ register const char *str;
+ {
+   register char *cp;
+ 
++  if(str == NULL)
++    Panic(0, "SaveStr() received NULL - possibly failed crypt()");
+   if ((cp = malloc(strlen(str) + 1)) == NULL)
+     Panic(0, "%s", strnomem);
+   else