indexer: correct missing includes Docurium seems to choke on this header because it can't see both git_indexer_progress & git_indexer_progress_cb, let's add the include.
diff --git a/include/git2/odb.h b/include/git2/odb.h
index de60106..e8824b7 100644
--- a/include/git2/odb.h
+++ b/include/git2/odb.h
@@ -11,6 +11,7 @@
#include "types.h"
#include "oid.h"
#include "oidarray.h"
+#include "indexer.h"
/**
* @file git2/odb.h
diff --git a/include/git2/odb_backend.h b/include/git2/odb_backend.h
index 8d1401a..47e0dd4 100644
--- a/include/git2/odb_backend.h
+++ b/include/git2/odb_backend.h
@@ -9,6 +9,7 @@
#include "common.h"
#include "types.h"
+#include "indexer.h"
/**
* @file git2/backend.h
diff --git a/include/git2/pack.h b/include/git2/pack.h
index de29831..08d2caf 100644
--- a/include/git2/pack.h
+++ b/include/git2/pack.h
@@ -9,6 +9,7 @@
#include "common.h"
#include "oid.h"
+#include "indexer.h"
/**
* @file git2/pack.h