pack-revindex: hide the definition of 'revindex_entry'

Now that all spots outside of pack-revindex.c that reference 'struct
revindex_entry' directly have been removed, it is safe to hide the
implementation by moving it from pack-revindex.h to pack-revindex.c.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: ttaylorr

pack-revindex.c

@@ -3,6 +3,11 @@
 #include "object-store.h"
 #include "packfile.h"
 
+struct revindex_entry {
+	off_t offset;
+	unsigned int nr;
+};
+
 /*
  * Pack index for existing packs give us easy access to the offsets into
  * corresponding pack file where each object's data starts, but the entries

pack-revindex.h

@@ -18,11 +18,6 @@
 
 struct packed_git;
 
-struct revindex_entry {
-	off_t offset;
-	unsigned int nr;
-};
-
 /*
  * load_pack_revindex populates the revindex's internal data-structures for the
  * given pack, returning zero on success and a negative value otherwise.