- Removed explicit run-time spec-file requirement on mozilla. The Mozilla
        NSS API/ABI stabilised by version 1.7.3 The libraries are always
        located in the libdir However, the headers are in
        /usr/include/mozilla-%{mozilla_build_version} and so they move each
        time the mozilla version changes. So we no longer have an explicit
        mozilla run-time requirement in the specfile; a requirement on the
        appropriate NSS and NSPR .so files is automagically generated on build.
        We have an explicit, exact build-time version, so that we can find the
        headers (without invoking an RPM query from the spec file; to do so is
        considered bad practice)
    - Introduced mozilla_build_version, to replace mozilla_version
    - Set mozilla_build_version to 1.7.6 to reflect current state of tree