repack-promisor: add missing headers

According to the coding guidelines, a C file must directly include the
header files that declare the facilities it uses.

Directly include these missing headers, in order to comply with the
coding guidelines.

Signed-off-by: LorenzoPegorari <lorenzo.pegorari2002@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: LorenzoPegorari

repack-promisor.c

@@ -1,11 +1,17 @@
 #include "git-compat-util.h"
 #include "repack.h"
+#include "hash.h"
 #include "hex.h"
+#include "odb.h"
 #include "pack.h"
 #include "packfile.h"
 #include "path.h"
 #include "repository.h"
 #include "run-command.h"
+#include "strbuf.h"
+#include "string-list.h"
+#include "strmap.h"
+#include "strvec.h"
 
 struct write_oid_context {
 	struct child_process *cmd;