Fixes return type of SCOTCH_graphInduceList and SCOTCH_graphInducePart
so that the definition matches with -DINTSIZE64.

Reported upstream at
https://gforge.inria.fr/tracker/index.php?func=detail&aid=21608&group_id=248&atid=1081

--- scotch_6.0.5a/src/libscotch/library.h.orig	2018-02-11 10:52:38.000000000 -0600
+++ scotch_6.0.5a/src/libscotch/library.h	2018-02-23 16:56:41.000000000 -0600
@@ -199,8 +199,8 @@
 int                         SCOTCH_graphGeomSaveChac (const SCOTCH_Graph * const, const SCOTCH_Geom * const, FILE * const, FILE * const, const char * const);
 int                         SCOTCH_graphGeomSaveMmkt (const SCOTCH_Graph * const, const SCOTCH_Geom * const, FILE * const, FILE * const, const char * const);
 int                         SCOTCH_graphGeomSaveScot (const SCOTCH_Graph * const, const SCOTCH_Geom * const, FILE * const, FILE * const, const char * const);
-int                         SCOTCH_graphInduceList (const SCOTCH_Graph * const, const SCOTCH_Num, const SCOTCH_Num * const, SCOTCH_Graph * const);
-int                         SCOTCH_graphInducePart (const SCOTCH_Graph * const, const SCOTCH_Num, const SCOTCH_GraphPart2 * const, const SCOTCH_GraphPart2, SCOTCH_Graph * const);
+SCOTCH_Num                  SCOTCH_graphInduceList (const SCOTCH_Graph * const, const SCOTCH_Num, const SCOTCH_Num * const, SCOTCH_Graph * const);
+SCOTCH_Num                  SCOTCH_graphInducePart (const SCOTCH_Graph * const, const SCOTCH_Num, const SCOTCH_GraphPart2 * const, const SCOTCH_GraphPart2, SCOTCH_Graph * const);
 
 int                         SCOTCH_graphMapInit (const SCOTCH_Graph * const, SCOTCH_Mapping * const, const SCOTCH_Arch * const, SCOTCH_Num * const);
 void                        SCOTCH_graphMapExit (const SCOTCH_Graph * const, SCOTCH_Mapping * const);
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