fix tinyxml cmake files (#333)

Author: drelaptop

tinyxml2/CMakeLists.txt

@@ -15,6 +15,15 @@ add_library(${target_name} STATIC
 
 target_include_directories(${target_name} PUBLIC .)
 
+include(../cmake/CocosExternalConfig.cmake)
+if(WINDOWS)
+  if(BUILD_SHARED_LIBS)
+    target_compile_definitions(${target_name} PRIVATE _USRDLL)
+  else()
+    target_compile_definitions(${target_name} PRIVATE CC_STATIC)
+  endif()
+endif()
+
 set_target_properties(${target_name}
     PROPERTIES
     ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"