patch 8.1.1939: code for handling v: variables in generic eval file

Problem:    Code for handling v: variables in generic eval file.
Solution:   Move v: variables to evalvars.c. (Yegappan Lakshmanan,
            closes #4872)
diff --git a/src/proto/evalvars.pro b/src/proto/evalvars.pro
index dc4a791..fde1ada 100644
--- a/src/proto/evalvars.pro
+++ b/src/proto/evalvars.pro
@@ -1,4 +1,11 @@
 /* evalvars.c */
+void evalvars_init(void);
+void evalvars_clear(void);
+int garbage_collect_vimvars(int copyID);
+int garbage_collect_scriptvars(int copyID);
+void set_internal_string_var(char_u *name, char_u *value);
+void prepare_vimvar(int idx, typval_T *save_tv);
+void restore_vimvar(int idx, typval_T *save_tv);
 void ex_let(exarg_T *eap);
 void ex_const(exarg_T *eap);
 int ex_let_vars(char_u *arg_start, typval_T *tv, int copy, int semicolon, int var_count, int is_const, char_u *op);
@@ -7,8 +14,33 @@
 void ex_unlet(exarg_T *eap);
 void ex_lockvar(exarg_T *eap);
 int do_unlet(char_u *name, int forceit);
+char_u *get_user_var_name(expand_T *xp, int idx);
+void set_vim_var_nr(int idx, varnumber_T val);
+typval_T *get_vim_var_tv(int idx);
+varnumber_T get_vim_var_nr(int idx);
+char_u *get_vim_var_str(int idx);
+list_T *get_vim_var_list(int idx);
+dict_T *get_vim_var_dict(int idx);
+void set_vim_var_char(int c);
+void set_vcount(long count, long count1, int set_prevcount);
+void save_vimvars(vimvars_save_T *vvsave);
+void restore_vimvars(vimvars_save_T *vvsave);
+void set_vim_var_string(int idx, char_u *val, int len);
+void set_vim_var_list(int idx, list_T *val);
+void set_vim_var_dict(int idx, dict_T *val);
+void set_reg_var(int c);
+char_u *v_exception(char_u *oldval);
+char_u *v_throwpoint(char_u *oldval);
+char_u *set_cmdarg(exarg_T *eap, char_u *oldarg);
 int get_var_tv(char_u *name, int len, typval_T *rettv, dictitem_T **dip, int verbose, int no_autoload);
+void check_vars(char_u *name, int len);
+dictitem_T *find_var(char_u *name, hashtab_T **htp, int no_autoload);
+dictitem_T *find_var_in_ht(hashtab_T *ht, int htname, char_u *varname, int no_autoload);
+hashtab_T *find_var_ht(char_u *name, char_u **varname);
 char_u *get_var_value(char_u *name);
+void new_script_vars(scid_T id);
+void init_var_dict(dict_T *dict, dictitem_T *dict_var, int scope);
+void unref_var_dict(dict_T *dict);
 void vars_clear(hashtab_T *ht);
 void vars_clear_ext(hashtab_T *ht, int free_val);
 void delete_var(hashtab_T *ht, hashitem_T *hi);
@@ -19,6 +51,8 @@
 int var_check_func_name(char_u *name, int new_var);
 int var_check_lock(int lock, char_u *name, int use_gettext);
 int valid_varname(char_u *varname);
+void reset_v_option_vars(void);
+void assert_error(garray_T *gap);
 int var_exists(char_u *var);
 void f_gettabvar(typval_T *argvars, typval_T *rettv);
 void f_gettabwinvar(typval_T *argvars, typval_T *rettv);