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='2019-02-19 15:47:35 -0500'>2019-02-19</span></td><td><a href='/guix/commit/gnu/packages/gd.scm?id=c12b23469576fb1c3920120ef06b696daa30b855'>gnu: libgd: Fix CVE-2019-{6977,6978}.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gd.scm (gd)[replacement]: New field.
(gd/fixed): New variable.
* gnu/packages/patches/gd-CVE-2019-6977.patch,
gnu/packages/patches/gd-CVE-2019-6978.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
</span></span></td><td>Leo Famulari</td></tr>