Log Message:
Update textproc/the_silver_searcher to 2.1.0

pkgsrc changes:
- Also include pthread bl3 (ag(1) uses pthread(3))

Changes:
2.1.0
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- Add plist filetype support
- Add md alias for markdown filetype
- Add support for setting CPU affinity on FreeBSD
- Add nix filetype support
- Add support for asciidoc, org-mode and ipython-notebook filetypes
- Add handlebars filetype support