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='2019-04-14 10:45:58 +0100'>2019-04-14</span></td><td><a href='/guix/commit/gnu/packages/perl-web.scm?id=618d52a6075d7f2a130cb2eee997a57e54588bcd'>gnu: Add perl-uri-db.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2019-04-14 10:45:58 +0100'>2019-04-14</span></td><td><a href='/guix/commit/gnu/packages/perl-web.scm?id=ce6bea4439cd886de5709c6b1a5cebb11c4724a8'>gnu: Add perl-uri-nested.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2019-03-25 01:59:50 +0300'>2019-03-25</span></td><td><a href='/guix/commit/gnu/packages/perl-web.scm?id=b9a57fd1b297592f7382c76490b0293e7125f183'>gnu: perl-uri-escape: Update source tarball URL.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2019-03-23 00:11:10 +0100'>2019-03-23</span></td><td><a href='/guix/commit/gnu/packages/perl-web.scm?id=d5b5d5826c6bbc6c25b7a7d39cce771e8e96832b'>gnu: perl-uri-escape: Update to 1.76.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>