patch 8.1.0779: argument for message functions is inconsistent

Problem:    Argument for message functions is inconsistent.
Solution:   Make first argument to msg() "char *".
diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 7d73f6c..1e673e3 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -25,7 +25,7 @@
 void *call_func_retlist(char_u *func, int argc, typval_T *argv);
 int eval_foldexpr(char_u *arg, int *cp);
 void ex_let(exarg_T *eap);
-void list_hashtable_vars(hashtab_T *ht, char_u *prefix, int empty, int *first);
+void list_hashtable_vars(hashtab_T *ht, char *prefix, int empty, int *first);
 char_u *get_lval(char_u *name, typval_T *rettv, lval_T *lp, int unlet, int skip, int flags, int fne_flags);
 void clear_lval(lval_T *lp);
 void *eval_for_line(char_u *arg, int *errp, char_u **nextcmdp, int skip);
diff --git a/src/proto/message.pro b/src/proto/message.pro
index 588c3a7..792ac5d 100644
--- a/src/proto/message.pro
+++ b/src/proto/message.pro
@@ -1,8 +1,8 @@
 /* message.c */
-int msg(char_u *s);
-int verb_msg(char_u *s);
-int msg_attr(char_u *s, int attr);
-int msg_attr_keep(char_u *s, int attr, int keep);
+int msg(char *s);
+int verb_msg(char *s);
+int msg_attr(char *s, int attr);
+int msg_attr_keep(char *s, int attr, int keep);
 char_u *msg_strtrunc(char_u *s, int force);
 void trunc_string(char_u *s, char_u *buf, int room_in, int buflen);
 void reset_last_sourcing(void);
@@ -11,21 +11,12 @@
 void ignore_error_for_testing(char_u *error);
 void do_perror(char *msg);
 int emsg(char *s);
-
-int semsg(const char *s, ...)
-#ifdef USE_PRINTF_FORMAT_ATTRIBUTE
-    __attribute__((format(printf, 1, 2)))
-#endif
-;
+int semsg(const char *s, ...);
 void iemsg(char *s);
-void siemsg(const char *s, ...)
-#ifdef USE_PRINTF_FORMAT_ATTRIBUTE
-    __attribute__((format(printf, 1, 2)))
-#endif
-;
+void siemsg(const char *s, ...);
 void internal_error(char *where);
 void emsg_invreg(int name);
-char_u *msg_trunc_attr(char_u *s, int force, int attr);
+char *msg_trunc_attr(char *s, int force, int attr);
 char_u *msg_may_trunc(int force, char_u *s);
 int delete_first_msg(void);
 void ex_messages(exarg_T *eap);
@@ -51,11 +42,11 @@
 char_u *str2special(char_u **sp, int from);
 void str2specialbuf(char_u *sp, char_u *buf, int len);
 void msg_prt_line(char_u *s, int list);
-void msg_puts(char_u *s);
-void msg_puts_title(char_u *s);
-void msg_puts_long_attr(char_u *longstr, int attr);
-void msg_puts_long_len_attr(char_u *longstr, int len, int attr);
-void msg_puts_attr(char_u *s, int attr);
+void msg_puts(char *s);
+void msg_puts_title(char *s);
+void msg_outtrans_long_attr(char_u *longstr, int attr);
+void msg_outtrans_long_len_attr(char_u *longstr, int len, int attr);
+void msg_puts_attr(char *s, int attr);
 int message_filtered(char_u *msg);
 void may_clear_sb_text(void);
 void sb_text_start_cmdline(void);