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/option.c b/src/option.c
index 8521c6e..b26c606 100644
--- a/src/option.c
+++ b/src/option.c
@@ -8364,10 +8364,10 @@
 }
 
 /*
- * Get the local or global value of 'backupcopy'.
+ * Get the local or global value of 'backupcopy' flags.
  */
     unsigned int
-get_bkc_value(buf_T *buf)
+get_bkc_flags(buf_T *buf)
 {
     return buf->b_bkc_flags ? buf->b_bkc_flags : bkc_flags;
 }
@@ -8386,7 +8386,7 @@
 #endif
 
 /*
- * Get the local or global value of the 'virtualedit' flags.
+ * Get the local or global value of 'virtualedit' flags.
  */
     unsigned int
 get_ve_flags(void)