Fix PCRE2 sys build for FreeBSD

[Rot127]

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• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
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Detailed description

Fix #4185 (comment)
PCRE2 system library was statically linked. Should not be of course.

Test plan

Locally

Closing issues

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