patch 8.2.0265: "eval" after "if 0" doesn't check for following command

Problem:    "eval" after "if 0" doesn't check for following command.
Solution:   Add "eval" to list of commands that check for a following command.
            (closes #5640)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 659af19..a819f64 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2375,6 +2375,7 @@
 	    case CMD_echoerr:
 	    case CMD_echomsg:
 	    case CMD_echon:
+	    case CMD_eval:
 	    case CMD_execute:
 	    case CMD_filter:
 	    case CMD_help: