code review 867046: runtime: fix build (panic) for FreeBSD

src/pkg/runtime/freebsd/thread.c

 // Use of this source file is governed by a BSD-style
 // license that can be found in the LICENSE file.`
 
 #include "runtime.h"
 #include "defs.h"
-#include "signals.h"
 #include "os.h"
 
 extern SigTab sigtab[];
+extern int32 sys_umtx_op(uint32*, int32, uint32, void*, void*);
 
 // FreeBSD's umtx_op syscall is effectively the same as Linux's futex, and
 // thus the code is largely similar. See linux/thread.c for comments.
 
 static void
 umtx_wait(uint32 *addr, uint32 val)
 {
         int32 ret;
 
         ret = sys_umtx_op(addr, UMTX_OP_WAIT, val, nil, nil);
@@ skipping 75 matching lines @@
 void·
 unlock(Lock *l)
 {
         m->locks--;
         if(m->locks < 0)
                 throw("lock count");
         umtx_unlock(l);
 }
 
 void
-destroylock(Lock *l)
+destroylock(Lock*)
 {
 }
 
 // Event notifications.
 void
 noteclear(Note *n)
 {
         n->lock.key = 0;
         umtx_lock(&n->lock);
 }
@@ skipping 72 matching lines @@
                 switch(g->sigcode0) {
                 case FPE_INTDIV:
                         panicstring("integer divide by zero");
                 case FPE_INTOVF:
                         panicstring("integer overflow");
                 }
                 panicstring("floating point error");
         }
         panicstring(sigtab[g->sig].name);
 }