mg-3.5-bp155.1.7

- Use latest release instead of the package from GitHub generated link as only
  release comes with configure script

- Use proper tarball

- Apply suggestions from review:
  * absolute URL is required so the tarball could be verified against the
    upstream provided one
  * use commonly used form for manpage files

- Remove %debug_package macro as mg-debuginfo already exists

- Initial version (3.5)