patch 8.1.0049: shell cannot tell running in a terminal window

Problem:    Shell cannot tell running in a terminal window.
Solution:   Add the VIM_TERMINAL environment variable. (Christian Brabandt)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    49,
 /**/
     48,
 /**/