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='2022-03-09 23:38:18 +0100'>2022-03-09</span></td><td><a href='/guix/commit/gnu/packages/hurd.scm?id=a9a64c19830ac0fc92bf9eac5d83751df683ff31'>gnu: hurd: Adjust to the transition from "--system" to "gnu.system".</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 0dc019e19a23fea614be5623360849ab9bc35e74, which
inadvertently led the Hurd to fail to boot.

* gnu/packages/hurd.scm (hurd)[arguments]: In 'create-runsystem' phase,
expect "gnu.system=" instead of "--system=".
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-02-15 22:43:29 +0100'>2022-02-15</span></td><td><a href='/guix/commit/gnu/packages/hurd.scm?id=6ec07f6b38f8839f837590823f181a37b016c6b0'>gnu: hurd: Remove leftover export.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hurd.scm: Remove 'hurd-triplet?' export.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>