Move PARTSDIR macro from libdpkg to dpkg-split

This is a private macro, internal to dpkg-split.

dpkg-split/dpkg-split.h

@@ -69,6 +69,8 @@ void addtopartlist(struct partinfo**, struct partinfo*, struct partinfo *refi);
 
 #define SPLITVERSION       "2.1"
 
+#define PARTSDIR          "parts/"
+
 #define PARTMAGIC         "!<arch>\ndebian-split    "
 #define HEADERALLOWANCE    1024
 

lib/dpkg/dpkg.h

@@ -75,7 +75,6 @@ DPKG_BEGIN_DECLS
 #define STATOVERRIDEFILE  "statoverride"
 #define UPDATESDIR        "updates/"
 #define INFODIR           "info/"
-#define PARTSDIR          "parts/"
 #define TRIGGERSDIR       "triggers/"
 #define TRIGGERSFILEFILE  "File"
 #define TRIGGERSDEFERREDFILE "Unincorp"