fix(omnivoice): link fused Android inference against libm

[lalalune]

Problem

The Android/bionic libelizainference.so linked successfully but failed at runtime with dlopen failed: cannot locate symbol "powf". Static objects folded into the final fused shared target use libm directly, and the dependency was not retained on that final target.

Fix

Link m on the final elizainference shared library for non-Apple Unix targets.

Evidence

• Rebuilt the arm64-v8a fused library with Android NDK 29
• llvm-readelf -d libelizainference.so now reports NEEDED: libm.so
• Stage audit reports 68 exported eliza_inference_* symbols and bionic dependencies libm.so, libdl.so, libc.so

Parent integration: elizaOS/eliza#16652