Address gcc errors, and other improvements

As reported by `Musse', the now default `-Werror=format-security' caused
building to fail due to usage of {,f}printf(3) with variable format
strings.

This did actually not affect this package security-wise before; the
affected files were built, but neither run nor included in the package.

Changes:
 * Only build what is needed.
   - The files affected by the security issues (and, thus, the gcc
     errors) are not built anymore.
   - Less make dependencies.
     * `makedepends' is now correct, building in chroot works.
 * Apply Debian patches; e.g.,
   * Port that one script from python2 to python3.
   * Fix the mentioned security issues--which would not affect this
     package anyways.
   - Remove the need for one of the sed calls.
     * The affected file is not built anymore, though.
 * Do not use pre-autogenerated Makefiles et al..
 * Other minor changes.

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