patch 8.1.1915: more functions can be used as methods

Problem:    More functions can be used as methods.
Solution:   Make various functions usable as a method.
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 14fc6df..b5e98f4 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -494,16 +494,16 @@
     {"ch_status",	1, 2, FEARG_1,	  f_ch_status},
 #endif
     {"changenr",	0, 0, 0,	  f_changenr},
-    {"char2nr",		1, 2, 0,	  f_char2nr},
-    {"chdir",		1, 1, 0,	  f_chdir},
-    {"cindent",		1, 1, 0,	  f_cindent},
-    {"clearmatches",	0, 1, 0,	  f_clearmatches},
-    {"col",		1, 1, 0,	  f_col},
-    {"complete",	2, 2, 0,	  f_complete},
-    {"complete_add",	1, 1, 0,	  f_complete_add},
+    {"char2nr",		1, 2, FEARG_1,	  f_char2nr},
+    {"chdir",		1, 1, FEARG_1,	  f_chdir},
+    {"cindent",		1, 1, FEARG_1,	  f_cindent},
+    {"clearmatches",	0, 1, FEARG_1,	  f_clearmatches},
+    {"col",		1, 1, FEARG_1,	  f_col},
+    {"complete",	2, 2, FEARG_2,	  f_complete},
+    {"complete_add",	1, 1, FEARG_1,	  f_complete_add},
     {"complete_check",	0, 0, 0,	  f_complete_check},
-    {"complete_info",	0, 1, 0,	  f_complete_info},
-    {"confirm",		1, 4, 0,	  f_confirm},
+    {"complete_info",	0, 1, FEARG_1,	  f_complete_info},
+    {"confirm",		1, 4, FEARG_1,	  f_confirm},
     {"copy",		1, 1, FEARG_1,	  f_copy},
 #ifdef FEAT_FLOAT
     {"cos",		1, 1, FEARG_1,	  f_cos},
@@ -511,16 +511,16 @@
 #endif
     {"count",		2, 4, FEARG_1,	  f_count},
     {"cscope_connection",0,3, 0,	  f_cscope_connection},
-    {"cursor",		1, 3, 0,	  f_cursor},
+    {"cursor",		1, 3, FEARG_1,	  f_cursor},
 #ifdef MSWIN
-    {"debugbreak",	1, 1, 0,	  f_debugbreak},
+    {"debugbreak",	1, 1, FEARG_1,	  f_debugbreak},
 #endif
-    {"deepcopy",	1, 2, 0,	  f_deepcopy},
-    {"delete",		1, 2, 0,	  f_delete},
-    {"deletebufline",	2, 3, 0,	  f_deletebufline},
+    {"deepcopy",	1, 2, FEARG_1,	  f_deepcopy},
+    {"delete",		1, 2, FEARG_1,	  f_delete},
+    {"deletebufline",	2, 3, FEARG_1,	  f_deletebufline},
     {"did_filetype",	0, 0, 0,	  f_did_filetype},
-    {"diff_filler",	1, 1, 0,	  f_diff_filler},
-    {"diff_hlID",	2, 2, 0,	  f_diff_hlID},
+    {"diff_filler",	1, 1, FEARG_1,	  f_diff_filler},
+    {"diff_hlID",	2, 2, FEARG_1,	  f_diff_hlID},
     {"empty",		1, 1, FEARG_1,	  f_empty},
     {"environ",		0, 0, 0,	  f_environ},
     {"escape",		2, 2, 0,	  f_escape},