Removed "-Wno-deprecated" from COMPILE_FLAGS

This feature is new to GCC 4.4, while OpenBSD uses 4.2.1
Stop tracking generated files

* files, generated as side-effect of running ``configure'' script,
* files, generated by ``configure'' script (Makefile, config.h),
* ``telegram'' binary.

All these files are setup-dependent and differ between targets.
Don't tracked Makefile and config.h

Both files are generated by ``configure'' script. Given that they:

  1. may change after running ``configure'' and
  2. are setup-dependent

there's no need to track them anyway.
Added support for OpenBSD