patch 8.0.0694: building in shadow directory does not work

Problem:    Building in shadow directory does not work.  Running Vim fails.
Solution:   Add the new libvterm directory.  Add missing change in command
            list.
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 02d5690..cde0157 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1483,6 +1483,9 @@
 EX(CMD_tearoff,		"tearoff",	ex_tearoff,
 			NEEDARG|EXTRA|TRLBAR|NOTRLCOM|CMDWIN,
 			ADDR_LINES),
+EX(CMD_terminal,	"terminal",	ex_terminal,
+			RANGE|NOTADR|EXTRA|TRLBAR|CMDWIN,
+			ADDR_OTHER),
 EX(CMD_tfirst,		"tfirst",	ex_tag,
 			RANGE|NOTADR|BANG|TRLBAR|ZEROR,
 			ADDR_LINES),