Add build definitions for Haiku, mostly following the other UNIX-like
platforms.
Fix atomic word definition

Provide an implementation of isless(x,y)

Use V8PRIxPTR format-specifier for intptr_t
Implement platform-haiku.cc, mostly following the Linux version
Fix choice of mmap address hint (see comment)
Merge V8 3.28.8.

Almost certaintly does not build or work.

Conflicts:
	build/common.gypi
	src/base/atomicops.h
	src/d8.gyp
	src/globals.h
	src/ia32/deoptimizer-ia32.cc
	src/platform.h
	tools/gyp/v8.gyp
	tools/utils.py