fix for building with system tinyxml

CMakeLists.txt

@@ -167,6 +167,7 @@ if(USE_SYSTEM_TINYXML)
     find_library(TINYXML_LIBRARIES tinyxml)
     find_path(TINYXML_INCLUDE_DIR tinyxml.h)
     message(STATUS "Found TinyXML: ${TINYXML_LIBRARIES} ${TINYXML_INCLUDE_DIR}")
+    add_definitions (-DTIXML_USE_STL)
     if(TINYXML_LIBRARIES AND TINYXML_INCLUDE_DIR)
         include_directories(${TINYXML_INCLUDE_DIR})
         message(STATUS "Using system TinyXML library.")

apps/openmw/CMakeLists.txt

@@ -119,6 +119,10 @@ target_link_libraries(openmw
     components
 )
 
+if (USE_SYSTEM_TINYXML)
+    target_link_libraries(openmw ${TINYXML_LIBRARIES})
+endif()
+
 if (NOT UNIX)
 target_link_libraries(openmw ${SDL2MAIN_LIBRARY})
 endif()