Experimental branch that reverts to no system includes for the runtime

Trying to debug an issue with pnacl clang 32-bit on windows
Was still including system stdint
Fix ifdef in buffer_t
Update nacl version

Required removing -O3 from runtime module compilation. Shouldn't matter
because they get optimized later.
Windows build fixes
Merge branch 'master' into no_runtime_includes

Conflicts:
	test/scripts/distrib_windows.ps1
Update runtime_internal for newer clangs
Fixed more sequence point ambiguities.
Turned off ms compatibility mode on runtime compilation (which breaks cross-compilation). Also turned off exceptions
Windows build tracks llvm trunk again
Merge branch 'master' into no_runtime_includes
Fix #404

Some new code was assuming the box required is always non-empty. Not so.
Fix for trunk llvm.
Merge branch 'master' into no_runtime_includes
Correct comment about native client in the readme

We no longer need the sdk to compile the runtime modules.
Update llvm version number for trunk in windows distrib
Fix missing deps and race conditions in HelloNaCl Makefile
Removed dead declaration.
Returned ScheduleHandles from FuncRefVar/FuncRefExpr assignments.
Fix deps and race conditions in nacl_demos Makefile