Fix mtmd library path in xcframework build script

The libmtmd.a library is now built in tools/mtmd/ instead of
build/mtmd.build/. Updated the library path in the combine_static_libraries
function to reflect the correct location.

This fix allows the xcframework build to complete successfully with
the mtmd library properly included in all platform variants.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: infil00p

build-xcframework.sh

@@ -269,7 +269,7 @@ combine_static_libraries() {
         "${base_dir}/${build_dir}/ggml/src/${release_dir}/libggml-cpu.a"
         "${base_dir}/${build_dir}/ggml/src/ggml-metal/${release_dir}/libggml-metal.a"
         "${base_dir}/${build_dir}/ggml/src/ggml-blas/${release_dir}/libggml-blas.a"
-        "${base_dir}/${build_dir}/build/mtmd.build/${release_dir}/libmtmd.a"
+        "${base_dir}/${build_dir}/tools/mtmd/${release_dir}/libmtmd.a"
         "${base_dir}/${build_dir}/common/${release_dir}/libcommon.a"
     )