config.h: remove unused git_configset_add_parameters()

This function was removed in ecec57b (config: respect includes in
protected config, 2022-10-13), but its prototype was left here.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Reviewed-by: Glen Choo <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

config.h

@@ -447,15 +447,6 @@ void git_configset_init(struct config_set *cs);
  */
 int git_configset_add_file(struct config_set *cs, const char *filename);
 
-/**
- * Parses command line options and environment variables, and adds the
- * variable-value pairs to the `config_set`. Returns 0 on success, or -1
- * if there is an error in parsing. The caller decides whether to free
- * the incomplete configset or continue using it when the function
- * returns -1.
- */
-int git_configset_add_parameters(struct config_set *cs);
-
 /**
  * Finds and returns the value list, sorted in order of increasing priority
  * for the configuration variable `key` and config set `cs`. When the