On some platforms sin and cos are calculated in single precision resulting in
diversity of results.

String checking and range cheching added.

Problems with Android 2.3.3 (API level 10) fixed;
Android 2.2 does not work due to unsupported camera frame format (known android-2.2 emulator issue).

 - exclude system paths from library search paths
 - remove hardcoded paths to compiler
 - enable compiling with 3d-parties
 - enable build as shared libraries