relicense: remove significant contributions from peetsv

- This is bundled into one commit to make it easy to revert if we do get
  consent from peetsv's company to relicense these contributions.

- Revert "dialign-tx adding patch for gcc@5.4.0 (#6413)"
  - This reverts commit 09eeb991.

- Remove the following LGPL-2.1 packages because we have not gotten
  consent to relicense them:
  - fast-gbs
  - igv
  - metasv
  - perl-xml-libxml
  - py-cnvkit
  - py-crossmap
  - py-pybedtools
  - py-pyfaidx
  - py-pyvcf
  - py-vmd-python
  - r-cghflasso
  - r-dismo
  - r-proc
  - r-spatial
  - r-utf8