patch 9.1.0219: Vim9: No enum support

Problem:  No enum support
Solution: Implement enums for Vim9 script
          (Yegappan Lakshmanan)

closes: #14224

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/evalvars.c b/src/evalvars.c
index de9d5b2..f16d475 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -159,6 +159,8 @@
     {VV_NAME("maxcol",		 VAR_NUMBER), NULL, VV_RO},
     {VV_NAME("python3_version",	 VAR_NUMBER), NULL, VV_RO},
     {VV_NAME("t_typealias",	 VAR_NUMBER), NULL, VV_RO},
+    {VV_NAME("t_enum",		 VAR_NUMBER), NULL, VV_RO},
+    {VV_NAME("t_enumvalue",	 VAR_NUMBER), NULL, VV_RO},
 };
 
 // shorthand
@@ -262,6 +264,8 @@
     set_vim_var_nr(VV_TYPE_CLASS,   VAR_TYPE_CLASS);
     set_vim_var_nr(VV_TYPE_OBJECT,  VAR_TYPE_OBJECT);
     set_vim_var_nr(VV_TYPE_TYPEALIAS,  VAR_TYPE_TYPEALIAS);
+    set_vim_var_nr(VV_TYPE_ENUM,  VAR_TYPE_ENUM);
+    set_vim_var_nr(VV_TYPE_ENUMVALUE,  VAR_TYPE_ENUMVALUE);
 
     set_vim_var_nr(VV_ECHOSPACE,    sc_col - 1);