Fix headers for the new Revision Walker

The "oid.h" header is now included instead of "object.h".

The old "revwalk.h" header has been removed; it was empty.

include/git2/revwalk.h

@@ -27,7 +27,7 @@
 
 #include "common.h"
 #include "types.h"
-#include "object.h"
+#include "oid.h"
 
 /**
  * @file git2/revwalk.h

src/commit.c

@@ -30,7 +30,6 @@
 
 #include "common.h"
 #include "commit.h"
-#include "revwalk.h"
 #include "signature.h"
 
 #define COMMIT_BASIC_PARSE 0x0

src/revwalk.c

@@ -25,10 +25,11 @@
 
 #include "common.h"
 #include "commit.h"
-#include "revwalk.h"
 #include "hashtable.h"
 #include "pqueue.h"
 
+#include "git2/revwalk.h"
+
 typedef struct commit_object {
 	git_oid oid;
 	uint32_t time;

src/revwalk.h

-#ifndef INCLUDE_revwalk_h__
-#define INCLUDE_revwalk_h__
-
-#include "git2/common.h"
-#include "git2/revwalk.h"
-
-#include "commit.h"
-#include "repository.h"
-#include "hashtable.h"
-
-#endif /* INCLUDE_revwalk_h__ */

src/tag.c

@@ -27,7 +27,6 @@
 #include "commit.h"
 #include "tag.h"
 #include "signature.h"
-#include "revwalk.h"
 #include "git2/object.h"
 #include "git2/repository.h"
 #include "git2/signature.h"

src/tree.c

@@ -25,7 +25,6 @@
 
 #include "common.h"
 #include "commit.h"
-#include "revwalk.h"
 #include "tree.h"
 #include "git2/repository.h"
 #include "git2/object.h"

tests/t05-revwalk.c

@@ -25,8 +25,6 @@
 #include "test_lib.h"
 #include "test_helpers.h"
 
-#include "revwalk.h"
-
 /*
 	$ git log --oneline --graph --decorate
 	*   a4a7dce (HEAD, br2) Merge branch 'master' into br2