Fix centrallix-lib Test Linking Failure

[Lightning11wins]

Adds -lm to the centrallix-lib test build so code that #includes math.h and uses it won't cause a linker error.

[Lightning11wins]

@greptileai please review

[greptile-apps]

Greptile Summary

The PR fixes the centrallix-lib test linkage by appending the math library to LIBS, placing -lm after the test sources and static archive on the linker command line.

• Adds -lm to the shared linker-library variable.
• Corrects the order-sensitive linkage issue reported previously.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
centrallix-lib/Makefile.in	The math library is now supplied through LIBS, which each relevant link command expands after its objects and archives.

_{Reviews (2): Last reviewed commit: "Move -lm to LIBS so it follows libCentra..." | Re-trigger Greptile}

[Lightning11wins]

This PR is ready for human review.

[gbeeley]

Looks good - thanks