patch 8.2.5171: dependencies and proto files are outdated

Problem:    Dependencies and proto files are outdated.
Solution:   Update dependencies and proto files.  Avoid errors.
diff --git a/src/proto/getchar.pro b/src/proto/getchar.pro
index a034257..47af0bb 100644
--- a/src/proto/getchar.pro
+++ b/src/proto/getchar.pro
@@ -24,7 +24,7 @@
 void stop_redo_ins(void);
 int noremap_keys(void);
 int ins_typebuf(char_u *str, int noremap, int offset, int nottyped, int silent);
-int ins_char_typebuf(int c, int modifier);
+int ins_char_typebuf(int c, int modifiers);
 int typebuf_changed(int tb_change_cnt);
 int typebuf_typed(void);
 int typebuf_maplen(void);