Copyright for golang-github-seccomp-libseccomp-golang source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: libseccomp-golang
Source: https://github.com/seccomp/libseccomp-golang

Files: *
Copyright:
    2015 Matthew Heon 
    2015 Paul Moore 
License: BSD-2-clause

Files: debian/*
Copyright: 2016-2019 Dmitry Smirnov 
License: BSD-2-clause

License: BSD-2-clause
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  - Redistributions of source code must retain the above copyright notice,
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  - Redistributions in binary form must reproduce the above copyright notice,
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