code review 4832060: runtime: correct seh installation during callbacks

src/pkg/runtime/runtime.h

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 /*
  * basic types
  */
 typedef signed char             int8;
 typedef unsigned char           uint8;
 typedef signed short            int16;
@@ skipping 230 matching lines @@
         M*      schedlink;
         uint32  machport;       // Return address for Mach IPC (OS X)
         MCache  *mcache;
         FixAlloc        *stackalloc;
         G*      lockedg;
         G*      idleg;
         uint32  freglo[16];     // D[i] lsb and F[i]
         uint32  freghi[16];     // D[i] msb and F[i+16]
         uint32  fflag;          // floating point compare flags
 #ifdef __WINDOWS__
-        void*   sehframe;
-
 #ifdef _64BIT···
         void*   gostack;
 #endif
-
 #endif
 };
 
 struct  Stktop
 {
         // The offsets of these fields are known to (hard-coded in) libmach.
         uint8*  stackguard;
         uint8*  stackbase;
         Gobuf   gobuf;
         uint32  argsize;
@@ skipping 359 matching lines @@
 Hmap*   runtime·makemap_c(Type*, Type*, int64);
 
 Hchan*  runtime·makechan_c(Type*, int64);
 void    runtime·chansend(Hchan*, void*, bool*);
 void    runtime·chanrecv(Hchan*, void*, bool*, bool*);
 int32   runtime·chanlen(Hchan*);
 int32   runtime·chancap(Hchan*);
 
 void    runtime·ifaceE2I(struct InterfaceType*, Eface, Iface*);