port 1.2.6 to android

Add Android support:

• add non-standard pthread_cancel(3)
• add non-standard lockf(3)
• import getifaddrs(3): android-ifaddrs
• add Android-specifc startup and config logic, including fixing races that only happen on Android
• fix the headers
  miredo.zip contains static ARM binaries compiled for API Level 9. It also builds for API Level 17. The binaries differ by one byte each, containing either a tab (9) or 0x11 (17).