cleanup: Don't make nbis depend on libfprint built-sources

Now that nbis is a static library it should be possible to compile it
without any fprint-built dependency, although since it included fp_internal
there was a compile-time dependency on the fp-enums that can be generated at
later times.

So:
 - Move nbis-helpers to nbis includes (and remove inclusion in fp_internal)
 - Move the Minutiae definitions inside a standalone fpi-minutiae header
 - Include fpi-minutiae.h in fp_internal.h
 - Include nbis-hepers.h and fpi-minutiae.h in nbis' lfs.h
 - Adapt missing definitions in libfprint

libfprint/fp_internal.h

@@ -1,6 +1,6 @@
 /*
  * Internal/private definitions for libfprint
- * Copyright (C) 2007-2008 Daniel Drake <dsd@gentoo.org>
+ * Copyright (C) 2019 Marco Trevisan <marco.trevisan@canonical.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -17,38 +17,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#ifndef __FPRINT_INTERNAL_H__
-#define __FPRINT_INTERNAL_H__
+#pragma once
 
 #include "fpi-log.h"
-#include "nbis-helpers.h"
 #include "fpi-image.h"
 #include "fpi-image-device.h"
-
-/* fp_minutia structure definition */
-struct fp_minutia
-{
-  int    x;
-  int    y;
-  int    ex;
-  int    ey;
-  int    direction;
-  double reliability;
-  int    type;
-  int    appearing;
-  int    feature_id;
-  int   *nbrs;
-  int   *ridge_counts;
-  int    num_nbrs;
-};
-
-/* fp_minutiae structure definition */
-struct fp_minutiae
-{
-  int                 alloc;
-  int                 num;
-  struct fp_minutia **list;
-};
-
-
-#endif
+#include "fpi-minutiae.h"