code review 5490053: runtime: make more build-friendly

src/pkg/runtime/mfixalloc.c

 // 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.
 
 // Fixed-size object allocator.  Returned memory is not zeroed.
 //
 // See malloc.h for overview.
 
 #include "runtime.h"
-#include "arch.h"
+#include "arch_GOARCH.h"
 #include "malloc.h"
 
 // Initialize f to allocate objects of the given size,
 // using the allocator to obtain chunks of memory.
 void
 runtime·FixAlloc_Init(FixAlloc *f, uintptr size, void *(*alloc)(uintptr), void (*first)(void*, byte*), void *arg)
 {
         f->size = size;
         f->alloc = alloc;
         f->first = first;
@@ skipping 33 matching lines @@
 }
 
 void
 runtime·FixAlloc_Free(FixAlloc *f, void *p)
 {
         f->inuse -= f->size;
         *(void**)p = f->list;
         f->list = p;
 }