Complete prototype of git_config_from_parameters()

Add the missing argument list.  (Its lack triggered a compiler warning
for me.)

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Acked-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/cache.h b/cache.h
index 4a0c75d..73f0f7b 100644
--- a/cache.h
+++ b/cache.h
@@ -933,7 +933,7 @@
 extern int git_default_config(const char *, const char *, void *);
 extern int git_config_from_file(config_fn_t fn, const char *, void *);
 extern int git_config_parse_parameter(const char *text);
-extern int git_config_from_parameters();
+extern int git_config_from_parameters(config_fn_t fn, void *data);
 extern int git_config(config_fn_t fn, void *);
 extern int git_parse_ulong(const char *, unsigned long *);
 extern int git_config_int(const char *, const char *);