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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<div class='path'>path: <a href='/guix/log/?id=2cab0e12b4bab3f79f11cf89598bcd8b167e5ba5'>root</a>/<a href='/guix/log/gnu?id=2cab0e12b4bab3f79f11cf89598bcd8b167e5ba5'>gnu</a>/<a href='/guix/log/gnu/packages?id=2cab0e12b4bab3f79f11cf89598bcd8b167e5ba5'>packages</a>/<a href='/guix/log/gnu/packages/avr.scm?id=2cab0e12b4bab3f79f11cf89598bcd8b167e5ba5'>avr.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/avr.scm?id=2cab0e12b4bab3f79f11cf89598bcd8b167e5ba5&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-13 21:07:40 +0200'>2020-05-13</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=fd96ae4a709c5509f2d78af3968d64fe805ad1ef'>gnu: avr-gcc: Fix conflicting GCC headers.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-03-01 12:52:43 +0100'>2020-03-01</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=2f3515f7369d91d8922620044f9348cc727b6c10'>gnu: avr-gcc: Fix compiler lookup paths.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>