patch 9.0.0002: map functionality outside of map.c

Problem:    Map functionality outside of map.c.
Solution:   Move f_hasmapto() to map.c.  Rename a function. (closes #10611)
diff --git a/src/proto/map.pro b/src/proto/map.pro
index 5caa859..1ed088d 100644
--- a/src/proto/map.pro
+++ b/src/proto/map.pro
@@ -3,7 +3,7 @@
 mapblock_T *get_buf_maphash_list(int state, int c);
 int is_maphash_valid(void);
 int do_map(int maptype, char_u *arg, int mode, int abbrev);
-void map_clear_int(buf_T *buf, int mode, int local, int abbr);
+void map_clear_mode(buf_T *buf, int mode, int local, int abbr);
 int mode_str2flags(char_u *modechars);
 int map_to_exists(char_u *str, char_u *modechars, int abbr);
 int map_to_exists_mode(char_u *rhs, int mode, int abbr);
@@ -17,6 +17,7 @@
 int put_escstr(FILE *fd, char_u *strstart, int what);
 void check_map_keycodes(void);
 char_u *check_map(char_u *keys, int mode, int exact, int ign_mod, int abbr, mapblock_T **mp_ptr, int *local_ptr);
+void f_hasmapto(typval_T *argvars, typval_T *rettv);
 void f_maplist(typval_T *argvars, typval_T *rettv);
 void f_maparg(typval_T *argvars, typval_T *rettv);
 void f_mapcheck(typval_T *argvars, typval_T *rettv);