Make RDC to respect the LD_LIBRARY_PATH pass by the cmake

The RDC override the LD_LIBRARY_PATH to force to use the current grpc
path. The change will also add original LD_LIBRARY_PATH to it.

Change-Id: I48da84c3135c6ede129c3cb9148dbb1896b652c3

CMakeLists.txt

@@ -162,7 +162,8 @@ if(BUILD_STANDALONE)
    set(GRPC_PLUGIN "${GRPC_ROOT}/bin/grpc_cpp_plugin")
    set(GRPC_LIB_DIR "${GRPC_ROOT}/lib")
 
-   set(ENV{LD_LIBRARY_PATH} ${GRPC_LIB_DIR}:${GRPC_LIB_DIR}64)
+   set(ENV{LD_LIBRARY_PATH} ${GRPC_LIB_DIR}:${GRPC_LIB_DIR}64:$ENV{LD_LIBRARY_PATH})
+   message("LD_LIBRARY_PATH = $ENV{LD_LIBRARY_PATH}")
    foreach(file ${PROTOB_DEF_SRC_FILES})
        execute_process(COMMAND
                ${PROTOB_CMD} --proto_path=${PROTOB_SRC_DIR}