Define O_BINARY for non-Windows platforms.

All tools (aapt, aidl, dexdump, etc.) need this flag to open()
binary files, or they risk reading corrupted data on Windows.

A bunch of these tools just conditionaly define O_BINARY in
their C files. Seems it would just make sense to define it globally.

Change-Id: Ia5c0a59e9e77bbdcbce235233555f611207abed8