config: remove git_config_maybe_bool

The function was deprecated in commit 89576613 ("treewide: deprecate
git_config_maybe_bool, use git_parse_maybe_bool", 2017-08-07) and has no
users.
Signed-off-by: NMartin Ågren <martin.agren@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/technical/api-config.txt

@@ -186,10 +186,6 @@ parsing is successful, the return value is the result.
 Same as `git_config_bool`, except that integers are returned as-is, and
 an `is_bool` flag is unset.
 
-`git_config_maybe_bool`::
-Deprecated. Use `git_parse_maybe_bool` instead. They are exactly the
-same, except this function takes an unused argument `name`.
-
 `git_parse_maybe_bool`::
 Same as `git_config_bool`, except that it returns -1 on error rather
 than dying.

config.c

@@ -956,11 +956,6 @@ int git_parse_maybe_bool(const char *value)
 	return -1;
 }
 
-int git_config_maybe_bool(const char *name, const char *value)
-{
-	return git_parse_maybe_bool(value);
-}
-
 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 {
 	int v = git_parse_maybe_bool_text(value);

config.h

@@ -56,7 +56,6 @@ extern unsigned long git_config_ulong(const char *, const char *);
 extern ssize_t git_config_ssize_t(const char *, const char *);
 extern int git_config_bool_or_int(const char *, const char *, int *);
 extern int git_config_bool(const char *, const char *);
-extern int git_config_maybe_bool(const char *, const char *);
 extern int git_config_string(const char **, const char *, const char *);
 extern int git_config_pathname(const char **, const char *, const char *);
 extern int git_config_set_in_file_gently(const char *, const char *, const char *);