repository: remove unnecessary include of path.h

This also made it clear that several .c files that depended upon path.h
were missing a #include for it; add the missing includes while at it.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

pack-write.c

@@ -10,6 +10,7 @@
 #include "oidmap.h"
 #include "pack-objects.h"
 #include "pack-revindex.h"
+#include "path.h"
 #include "wrapper.h"
 
 void reset_pack_idx_option(struct pack_idx_option *opts)