cgit_open_filter: also take the repo as a parameter

To prepare for handing repo configuration to the
filter script that is executed.

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/shared.c b/shared.c
index 7ec2e19..e4879df 100644
--- a/shared.c
+++ b/shared.c
@@ -376,7 +376,7 @@
 	return rv;
 }
 
-int cgit_open_filter(struct cgit_filter *filter)
+int cgit_open_filter(struct cgit_filter *filter, struct cgit_repo * repo)
 {
 
 	filter->old_stdout = chk_positive(dup(STDOUT_FILENO),