Switch to pcre2, Use SPDX license, Remove old patch
- Switch to pcre2
- Apply cherry-pick of https://github.com/dlundquist/sniproxy/commit/7fdd86c054a21f7ac62343010de20f28645b14d2 onto the 0.6.1 tag.
- Change to SPDX license identifier
- Remove old patch
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