[clang-repl] Always do export_executable_symbols_for_plugins(clang-repl)

It's needed to make clang-repl work in -DCLANG_PLUGIN_SUPPORT=OFF
configured builds (at least on mac). See discussion on
llvm#89811

clang/tools/clang-repl/CMakeLists.txt

@@ -61,10 +61,7 @@ clang_target_link_libraries(clang-repl PRIVATE
   clangInterpreter
   )
 
-# Support plugins.
-if(CLANG_PLUGIN_SUPPORT)
-  export_executable_symbols_for_plugins(clang-repl)
-endif()
+export_executable_symbols_for_plugins(clang-repl)
 
 # The clang-repl binary can get huge with static linking in debug mode.
 # Some 32-bit targets use PLT slots with limited branch range by default and we