[PATCH 0 of 8] Allow crossbuilding and Android support

[Per Olav Høydahl Ohme]

To allow crossbuilding:
- Added configure options informing about target platform.
- Avoiding executions of test programs for target platform features on host,
  including features with successfully compiled test programs.

Android support:
- Created Android config and init files, quite similar to existing Linux ones.
- Added crypt-function and code for globbing, and avoid O_DIRECT flag on Android