Fixes resolve protobuf library on MacOS. (#3043)

## What do these changes do?

The name `Protobuf_LIBRARIES` conflicts with the variable defined in
protobuf's cmake module, use `BUNDLED_Protobuf_LIBRARIES` instead.

## Related issue number

Fixes
https://github.com/alibaba/GraphScope/actions/runs/5614893711/job/15218852309

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

coordinator/gscoordinator/template/CMakeLists.template

@@ -290,37 +290,39 @@ endif()
 
 # address the "illegal thread local variable reference to regular symbol" error
 # in recent version of brew installed protobuf on MacOS
+set(BUNDLED_Protobuf_LIBRARIES)
 if (APPLE)
     # find bundled protobuf library
     if (EXISTS "${ANALYTICAL_ENGINE_HOME}/lib/libprotobuf.dylib")
-        set(Protobuf_LIBRARIES "${ANALYTICAL_ENGINE_HOME}/lib/libprotobuf.dylib")
+        set(BUNDLED_Protobuf_LIBRARIES "${ANALYTICAL_ENGINE_HOME}/lib/libprotobuf.dylib")
     elseif(EXISTS "${GRAPHSCOPE_ANALYTICAL_HOME}/lib/libprotobuf.dylib")
-        set(Protobuf_LIBRARIES "${GRAPHSCOPE_ANALYTICAL_HOME}/lib/libprotobuf.dylib")
+        set(BUNDLED_Protobuf_LIBRARIES "${GRAPHSCOPE_ANALYTICAL_HOME}/lib/libprotobuf.dylib")
     endif()
-    if (NOT Protobuf_LIBRARIES)
+    if (NOT BUNDLED_Protobuf_LIBRARIES)
         # search libprotobuf.xx.xxx.dylib in graphscope.dylibs
         file(GLOB PROTOBUF_LIBS "${ANALYTICAL_ENGINE_HOME}/../graphscope.dylibs/libprotobuf.*.dylib")
         if (PROTOBUF_LIBS)
-            list(GET PROTOBUF_LIBS 0 Protobuf_LIBRARIES)
+            list(GET PROTOBUF_LIBS 0 BUNDLED_Protobuf_LIBRARIES)
         endif()
     endif()
-    if (NOT Protobuf_LIBRARIES)
+    if (NOT BUNDLED_Protobuf_LIBRARIES)
         # search libprotobuf.xx.xxx.dylib in graphscope_runtime/.dylibs
         file(GLOB PROTOBUF_LIBS "${ANALYTICAL_ENGINE_HOME}/../graphscope_runtime/.dylibs/libprotobuf.*.dylib")
         if (PROTOBUF_LIBS)
-            list(GET PROTOBUF_LIBS 0 Protobuf_LIBRARIES)
+            list(GET PROTOBUF_LIBS 0 BUNDLED_Protobuf_LIBRARIES)
         endif()
     endif()
-    if (NOT Protobuf_LIBRARIES)
+    if (NOT BUNDLED_Protobuf_LIBRARIES)
         # search system-wide protobuf
         find_package (Protobuf QUIET)
         if (NOT Protobuf_FOUND)
             find_package (protobuf CONFIG REQUIRED)
         endif()
+        if (Protobuf_FOUND)
+            set(BUNDLED_Protobuf_LIBRARIES ${Protobuf_LIBRARIES})
+        endif()
     endif()
-    message("Using Protobuf_LIBRARIES: ${Protobuf_LIBRARIES}")
-else()
-    set(Protobuf_LIBRARIES)
+    message(STATUS "Using BUNDLED_Protobuf_LIBRARIES: ${BUNDLED_Protobuf_LIBRARIES}")
 endif()
 
 set(GRAPH_TYPE "$_graph_type")
@@ -455,8 +457,8 @@ if (OpenMP_FOUND)
     target_link_libraries(${FRAME_NAME} OpenMP::OpenMP_CXX)
 endif ()
 
-if (APPLE AND Protobuf_LIBRARIES)
-    target_link_libraries(${FRAME_NAME} ${Protobuf_LIBRARIES})
+if (APPLE AND BUNDLED_Protobuf_LIBRARIES)
+    target_link_libraries(${FRAME_NAME} ${BUNDLED_Protobuf_LIBRARIES})
 endif ()
 
 # include the inplace cmake config at the end, to avoid affecting the CMake search path