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='2018-05-29 18:29:36 +0200'>2018-05-29</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=a076f19908d06b6df49f1c25c40de8838213cd71'>CODE-OF-CONDUCT: Switch to version 1.4 of the Contributor Covenant.</a><span class='msg-avail'>...<span class='msg-tooltip'>See the discussion at
&lt;https://lists.gnu.org/archive/html/guix-devel/2018-05/msg00146.html&gt;.

* CODE-OF-CONDUCT: Adapt from version 1.4 of the Contributor Covenant.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-04-04 23:45:57 +0200'>2016-04-04</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=e314ce1bd7b21229c750ab7132feac8189da87ba'>CoC: Clarify which project we're talking about.</a><span class='msg-avail'>...<span class='msg-tooltip'>* CODE-OF-CONDUCT: Define "project" and "project maintainer" as
suggested by rms.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-12-09 14:29:41 +0100'>2015-12-09</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=e15fcdd149cec662fcaf4b550ee32879bd53a591'>Add "Contributor Covenant".</a><span class='msg-avail'>...<span class='msg-tooltip'>* CODE-OF-CONDUCT: New file, adapted from
  &lt;http://contributor-covenant.org/version/1/3/0/code_of_conduct.txt&gt;.
* doc/contributing.texi (Contributing): Mention it.
* Makefile.am (EXTRA_DIST): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>