patch 9.1.0472: Inconsistencies between functions for option flags

Problem:  Inconsistencies between functions for option flags.
Solution: Consistently use "unsigned int" as return type and rename
          get_bkc_value() to get_bkc_flags() (zeertzjq).

closes: #14925

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/proto/insexpand.pro b/src/proto/insexpand.pro
index 3d8c042..6b34c0f 100644
--- a/src/proto/insexpand.pro
+++ b/src/proto/insexpand.pro
@@ -27,7 +27,7 @@
 int ins_compl_add_infercase(char_u *str_arg, int len, int icase, char_u *fname, int dir, int cont_s_ipos);
 int ins_compl_has_shown_match(void);
 int ins_compl_long_shown_match(void);
-unsigned get_cot_flags(void);
+unsigned int get_cot_flags(void);
 int pum_wanted(void);
 void ins_compl_show_pum(void);
 char_u *find_word_start(char_u *ptr);
diff --git a/src/proto/option.pro b/src/proto/option.pro
index be7ee95..69463d4 100644
--- a/src/proto/option.pro
+++ b/src/proto/option.pro
@@ -139,7 +139,7 @@
 int can_bs(int what);
 long get_scrolloff_value(void);
 long get_sidescrolloff_value(void);
-unsigned int get_bkc_value(buf_T *buf);
+unsigned int get_bkc_flags(buf_T *buf);
 char_u *get_flp_value(buf_T *buf);
 unsigned int get_ve_flags(void);
 char_u *get_showbreak_value(win_T *win);