Makefile.inc1: fix intermittent libmagic build failure under high parallelism

[laffer1]

Summary

• Adds missing lib/libmagic__L: lib/libz__L dependency in Makefile.inc1
• lib/libmagic/Makefile has LIBADD= z but no __L ordering constraint was declared
• Under high parallelism (make -j28) the linker step for libmagic.so.4.full can race ahead of libz being installed into the sysroot

Observed failure:

ld: error: unable to find library -lz
cc: error: linker command failed with exit code 1
*** [libmagic.so.4.full] Error code 1

Same fix already merged to stable/4.0 in PR #399.

Test plan

• make -j28 buildworld on amd64 — confirm lib/libmagic builds cleanly
• make -j4 buildworld — confirm no regression at lower parallelism

🤖 Generated with Claude Code

Summary by Sourcery

Bug Fixes:

• Add an explicit libmagic-to-libz dependency to ensure libmagic linking does not race ahead of libz installation during parallel builds.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds an explicit build dependency so libmagic links against libz reliably under high parallelism by updating Makefile.inc1.

File-Level Changes

Change	Details	Files
Add missing libmagic → libz build dependency to avoid linker races under high parallelism.	Declare lib/libmagic__L dependency on lib/libz__L in the global build orchestration makefile. Ensure libz is built and installed into the sysroot before the libmagic shared library link step runs. Align main branch build dependencies with the already-fixed stable/4.0 branch for consistent behavior.	Makefile.inc1

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[gemini-code-assist]

Code Review

This pull request updates Makefile.inc1 to declare a dependency on lib/libz__L for lib/libmagic__L. There are no review comments, and I have no feedback to provide.

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[sourcery-ai]

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