doc: make -DWITH_ZMQ=ON explicit on build-unix.md #32696

1. 
   luisschwab commented at 10:44 pm on June 6, 2025: contributor

   ZMQ support is not built by default on Linux, and the docs don’t make that clear. This PR makes it explicit that the -DWITH_ZMQ=ON flag is required to build with ZMQ support on build-unix.md.
2. doc: make `-DWITH_ZMQ=ON` explicit on `build-unix.md` 32d4e92b9a
3. 
   DrahtBot commented at 10:44 pm on June 6, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32696.

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   LLM Linter (✨ experimental)

   Possible typos and grammar issues:

   • “require the following dependency.” -> “require the following dependency:” [uses a period where a colon is needed to introduce the list]

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4. DrahtBot added the label Docs on Jun 6, 2025
5. 
   maflcko commented at 5:59 am on June 7, 2025: member

   lgtm ACK 32d4e92b9ac81858d754487bfec2fef6bed13a57
6. fanquake merged this on Jun 10, 2025
7. fanquake closed this on Jun 10, 2025

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8. fanquake referenced this in commit aea8a394b1 on Jun 10, 2025
9. 
   fanquake commented at 4:29 pm on June 10, 2025: member

   Backported to 29.x in #32589.
10. TheCharlatan referenced this in commit f236a50dc1 on Jun 14, 2025
11. fanquake referenced this in commit 983b268768 on Jun 25, 2025
12. yuvicc referenced this in commit 069643f094 on Jul 6, 2025
13. yuvicc referenced this in commit 22f55cf11d on Aug 26, 2025
14. bug-castercv502 referenced this in commit cfdba67027 on Sep 28, 2025
15. stickies-v referenced this in commit a19c56cd7c on Nov 4, 2025
16. luisschwab deleted the branch on Nov 21, 2025

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luisschwab DrahtBot maflcko fanquake

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