Switch back to subprocessing for llama.cpp

This should resolve a number of memory leak and stability defects by allowing
us to isolate llama.cpp in a separate process and shutdown when idle, and
gracefully restart if it has problems.  This also serves as a first step to be
able to run multiple copies to support multiple models concurrently.

llm/generate/gen_common.sh

@@ -14,7 +14,7 @@ init_vars() {
 
     LLAMACPP_DIR=../llama.cpp
     CMAKE_DEFS=""
-    CMAKE_TARGETS="--target ext_server"
+    CMAKE_TARGETS="--target ollama_llama_server"
     if echo "${CGO_CFLAGS}" | grep -- '-g' >/dev/null; then
         CMAKE_DEFS="-DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_VERBOSE_MAKEFILE=on -DLLAMA_GPROF=on -DLLAMA_SERVER_VERBOSE=on ${CMAKE_DEFS}"
     else
@@ -81,27 +81,24 @@ apply_patches() {
 build() {
     cmake -S ${LLAMACPP_DIR} -B ${BUILD_DIR} ${CMAKE_DEFS}
     cmake --build ${BUILD_DIR} ${CMAKE_TARGETS} -j8
-    mkdir -p ${BUILD_DIR}/lib/
-    ls ${BUILD_DIR}
-    g++ -fPIC -g -shared -o ${BUILD_DIR}/lib/libext_server.${LIB_EXT} \
-        ${GCC_ARCH} \
-        ${WHOLE_ARCHIVE} ${BUILD_DIR}/ext_server/libext_server.a ${NO_WHOLE_ARCHIVE} \
-        ${BUILD_DIR}/common/libcommon.a \
-        ${BUILD_DIR}/libllama.a \
-        -Wl,-rpath,\$ORIGIN \
-        -lpthread -ldl -lm \
-        ${EXTRA_LIBS}
 }
 
-compress_libs() {
+compress() {
     echo "Compressing payloads to reduce overall binary size..."
     pids=""
-    rm -rf ${BUILD_DIR}/lib/*.${LIB_EXT}*.gz
-    for lib in ${BUILD_DIR}/lib/*.${LIB_EXT}* ; do
-        gzip -n --best -f ${lib} &
+    rm -rf ${BUILD_DIR}/bin/*.gz
+    for f in ${BUILD_DIR}/bin/* ; do
+        gzip -n --best -f ${f} &
         pids+=" $!"
     done
-    echo 
+    # check for lib directory
+    if [ -d ${BUILD_DIR}/lib ]; then
+        for f in ${BUILD_DIR}/lib/* ; do
+            gzip -n --best -f ${f} &
+            pids+=" $!"
+        done
+    fi
+    echo
     for pid in ${pids}; do
         wait $pid
     done