Add forward declarations.

--- fastcap/src/mulSetup.c.orig	2015-07-22 13:55:21.592119775 +0200
+++ fastcap/src/mulSetup.c	2015-07-22 14:08:50.157688209 +0200
@@ -35,6 +35,14 @@
 
 #include "mulGlobal.h"
 
+static getnbrs(ssystem*);
+static linkcubes(ssystem*);
+static setMaxq(ssystem*);
+static getAllInter(ssystem*);
+static set_vector_masks(ssystem*);
+static indexkid(ssystem*, cube*, int*, int*);
+static int placeq(int, ssystem*, charge*);
+
 cube *cstack[1024];		/* Stack used in several routines. */
 
 /*
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<tr><td><span title='2018-05-30 02:18:26 -0400'>2018-05-30</span></td><td><a href='/guix/commit/gnu/packages/swig.scm?id=a21bcd70792af2a618237cae75b51194482c24ea'>Revert "gnu: swig: Patch for Octave 4.4."</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
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<tr><td><span title='2016-07-29 14:18:07 -0400'>2016-07-29</span></td><td><a href='/guix/commit/gnu/packages/swig.scm?id=0bab3af0786ffd4caec05a29d7281ac5e5c18b6b'>Merge branch 'master' into core-updates</a></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2016-07-29 17:35:20 +0200'>2016-07-29</span></td><td><a href='/guix/commit/gnu/packages/swig.scm?id=0160458bf8a2a77a3ec0283b4bb98fb477ed09f9'>gnu: Use define-public to export packages.</a><span class='msg-avail'>...</span></td><td>David Craven</td></tr>
<tr><td><span title='2016-07-22 18:58:31 -0400'>2016-07-22</span></td><td><a href='/guix/commit/gnu/packages/swig.scm?id=d227260d2f7833b6bdc55b8e3792378626ef3b69'>Merge branch 'master' into core-updates</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-07-21 18:09:40 -0400'>2016-07-21</span></td><td><a href='/guix/commit/gnu/packages/swig.scm?id=de67e922885baf68a746a0484ca0b45e45b0964b'>gnu: Update URLs for sourceforge.net.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
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