add dependency on gcc-4.7 or gcc-4.8 for arm (needed for atomic builtins)
recommend dpkg-buildpackage over debuild

dpkg-buildpacakge
* does not create a source tarball (can take a while)
* does not automatically run lintian
on second thought, it looks like dpkg-buildpackage runs into trouble.
For some reason it ignores override_dh_auto_install and tries to
incorrectly guess how to install mpv.

Revert "recommend dpkg-buildpackage over debuild"

This reverts commit 5b4fc57391d6f58e11a1af4e9f436606bd0395c5.