[C++] Fixed the setting method of linker option. (apache#8554)

### Motivation

I don't think the following `--exclude-libs,ALL` are reflected in linker.
 [https://github.com/apache/pulsar/blob/f8080f4eb690d751f1b07ca54c23e1cd7774473f/pulsar-client-cpp/CMakeLists.txt#L214](https://github.com/apache/pulsar/blob/f8080f4eb690d751f1b07ca54c23e1cd7774473f/pulsar-client-cpp/CMakeLists.txt#L214)

I think `--exclude-libs,ALL` needs to be set in `add_link_options`.
 [add_link_options](https://cmake.org/cmake/help/latest/command/add_link_options.html)

`add_link_options` can be used from v3.13.
Therefore, fixed(reverted) `add_compile_options` to `set`.([apache#4071](apache#4071))

pulsar-client-cpp/CMakeLists.txt

@@ -211,7 +211,7 @@ if (NOT APPLE AND NOT MSVC)
     # we don't set options below to build _pulsar.so
     set(CMAKE_CXX_FLAGS_PYTHON "${CMAKE_CXX_FLAGS}")
     # Hide all non-exported symbols to avoid conflicts
-    add_compile_options(-fvisibility=hidden -Wl,--exclude-libs,ALL)
+    set(CMAKE_CXX_FLAGS " -fvisibility=hidden -Wl,--exclude-libs,ALL ${CMAKE_CXX_FLAGS}")
 endif ()
 
 if (LIB_ZSTD)

pulsar-client-cpp/python/CMakeLists.txt

@@ -27,7 +27,7 @@ SET(CMAKE_SHARED_LIBRARY_PREFIX )
 SET(CMAKE_SHARED_LIBRARY_SUFFIX .so)
 
 
-if (CMAKE_CXX_FLAGS_PYTHON)
+if (NOT APPLE AND NOT MSVC)
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_PYTHON}")
 endif()