patch 8.2.5034: there is no way to get the byte index from a virtual column

Problem:    There is no way to get the byte index from a virtual column.
Solution:   Add virtcol2col(). (Yegappan Lakshmanan, closes #10477,
            closes #10098)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index a5300a1..75c3456 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -2682,6 +2682,8 @@
 			ret_list_any,	    f_values},
     {"virtcol",		1, 2, FEARG_1,	    arg2_string_or_list_bool,
 			ret_virtcol,	    f_virtcol},
+    {"virtcol2col",	3, 3, FEARG_1,	    arg3_number,
+			ret_number,	    f_virtcol2col},
     {"visualmode",	0, 1, 0,	    arg1_bool,
 			ret_string,	    f_visualmode},
     {"wildmenumode",	0, 0, 0,	    NULL,