patch 8.1.1957: more code can be moved to evalvars.c

Problem:    More code can be moved to evalvars.c.
Solution:   Move code to where it fits better. (Yegappan Lakshmanan,
            closes #4883)
diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 1fd171c..b91774b 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -3,13 +3,6 @@
 varnumber_T num_modulus(varnumber_T n1, varnumber_T n2);
 void eval_init(void);
 void eval_clear(void);
-int var_redir_start(char_u *name, int append);
-void var_redir_str(char_u *value, int value_len);
-void var_redir_stop(void);
-int eval_charconvert(char_u *enc_from, char_u *enc_to, char_u *fname_from, char_u *fname_to);
-int eval_printexpr(char_u *fname, char_u *args);
-void eval_diff(char_u *origfile, char_u *newfile, char_u *outfile);
-void eval_patch(char_u *origfile, char_u *difffile, char_u *outfile);
 int eval_to_bool(char_u *arg, int *error, char_u **nextcmd, int skip);
 int eval_expr_typval(typval_T *expr, typval_T *argv, int argc, typval_T *rettv);
 int eval_expr_to_bool(typval_T *expr, int *error);
@@ -33,7 +26,6 @@
 int next_for_item(void *fi_void, char_u *arg);
 void free_for_info(void *fi_void);
 void set_context_for_expression(expand_T *xp, char_u *arg, cmdidx_T cmdidx);
-void del_menutrans_vars(void);
 int pattern_match(char_u *pat, char_u *text, int ic);
 int eval0(char_u *arg, typval_T *rettv, char_u **nextcmd, int evaluate);
 int eval1(char_u **arg, typval_T *rettv, int evaluate);
@@ -76,13 +68,11 @@
 char_u *tv_get_string_buf_chk(typval_T *varp, char_u *buf);
 void copy_tv(typval_T *from, typval_T *to);
 int item_copy(typval_T *from, typval_T *to, int deep, int copyID);
-void get_user_input(typval_T *argvars, typval_T *rettv, int inputdialog, int secret);
 void ex_echo(exarg_T *eap);
 void ex_echohl(exarg_T *eap);
+int get_echo_attr(void);
 void ex_execute(exarg_T *eap);
 char_u *find_option_end(char_u **arg, int *opt_flags);
-char_u *autoload_name(char_u *name);
-int script_autoload(char_u *name, int reload);
 void last_set_msg(sctx_T script_ctx);
 int typval_compare(typval_T *typ1, typval_T *typ2, exptype_T type, int type_is, int ic);
 char_u *typval_tostring(typval_T *arg);