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='2018-12-17 21:43:51 +0100'>2018-12-17</span></td><td><a href='/guix/commit/tests/opam.scm?id=cce654fabdf09cac7d18f9bad842ba8445aa022c'>import: Update opam importer.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-09-04 17:25:11 +0200'>2018-09-04</span></td><td><a href='/guix/commit/tests/opam.scm?id=ca719424455465fca4b872c371daf2a46de88b33'>Switch to Guile-Gcrypt.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-07-10 10:11:01 +0200'>2018-07-10</span></td><td><a href='/guix/commit/tests/opam.scm?id=b24443bff9f9f3f36353eea2ef35e6dc3745a417'>guix: Add opam importer.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>