runtime: fix netbsd after reorg (again)

R=golang-dev
CC=golang-dev
https://golang.org/cl/7719046

src/pkg/runtime/signal_netbsd_386.h

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-#define SIG_REGS(ctxt) (*((Sigcontext*)&((Ucontext*)(ctxt))->uc_mcontext))
+#define SIG_REGS(ctxt) (((Ucontext*)(ctxt))->uc_mcontext)
 
 #define SIG_EAX(info, ctxt) (SIG_REGS(ctxt).__gregs[REG_EAX])
 #define SIG_EBX(info, ctxt) (SIG_REGS(ctxt).__gregs[REG_EBX])

src/pkg/runtime/signal_netbsd_amd64.h

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-#define SIG_REGS(ctxt) (*((Sigcontext*)&((Ucontext*)(ctxt))->uc_mcontext))
+#define SIG_REGS(ctxt) (((Ucontext*)(ctxt))->uc_mcontext)
 
 #define SIG_RAX(info, ctxt) (SIG_REGS(ctxt).__gregs[REG_RAX])
 #define SIG_RBX(info, ctxt) (SIG_REGS(ctxt).__gregs[REG_RBX])

src/pkg/runtime/signal_netbsd_arm.h

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-#define SIG_REGS(ctxt) (*((Sigcontext*)&((Ucontext*)(ctxt))->uc_mcontext))
+#define SIG_REGS(ctxt) (((Ucontext*)(ctxt))->uc_mcontext)
 
 #define SIG_R0(info, ctxt) (SIG_REGS(ctxt).__gregs[0])
 #define SIG_R1(info, ctxt) (SIG_REGS(ctxt).__gregs[1])