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='2017-03-19 17:32:44 -0400'>2017-03-19</span></td><td><a href='/guix/commit/gnu/packages/patches/graphite2-ffloat-store.patch?id=4c20b0bcf7c8396cadc618a3df0127b864fd10f2'>gnu: graphite2: Fix test failure caused by rounding error on 32-bit CPUs.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>