Build multiple CPU variants and pick the best

This reduces the built-in linux version to not use any vector extensions
which enables the resulting builds to run under Rosetta on MacOS in
Docker.  Then at runtime it checks for the actual CPU vector
extensions and loads the best CPU library available

llm/generate/gen_common.sh

@@ -51,6 +51,16 @@ install() {
     cp ${BUILD_DIR}/libggml_static.a ${BUILD_DIR}/lib
 }
 
+link_server_lib() {
+    gcc -fPIC -g -shared -o ${BUILD_DIR}/lib/libext_server.so \
+        -Wl,--whole-archive \
+        ${BUILD_DIR}/lib/libext_server.a \
+        -Wl,--no-whole-archive \
+        ${BUILD_DIR}/lib/libcommon.a \
+        ${BUILD_DIR}/lib/libllama.a
+
+}
+
 # Keep the local tree clean after we're done with the build
 cleanup() {
     (cd ${LLAMACPP_DIR}/examples/server/ && git checkout CMakeLists.txt server.cpp)