First bugfix release - ZenGL 0.3.1.

Changelog:
- [Windows, OpenGL]fixed problem with Ctrl+Alt+Delete and message "Cannot set fullscreen mode"
- [GNU/Linux]removed dependency on newer GLIBC 2.14 when compile ZenGL with zip/jpeg/ogg support on newer systems with GLIBC 2.14+
- [iOS]fixed resolution problem with iPhone applications running on iPad
- fixed crash when cannot load some resources using res_* functions

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