cmake: Move TARGETS_EXPORT_NAME to top

CMakeLists.txt

@@ -48,6 +48,8 @@ set(CMAKE_VISIBILITY_INLINES_HIDDEN 1)
 # to distinguish between debug and release lib
 set(CMAKE_DEBUG_POSTFIX "d")
 
+set(TARGETS_EXPORT_NAME "${CMAKE_PROJECT_NAME}Targets")
+
 add_library(tinyxml2 tinyxml2.cpp tinyxml2.h)
 
 set_target_properties(tinyxml2 PROPERTIES
@@ -73,8 +75,6 @@ else()
     endif(MSVC)
 endif()
 
-set(TARGETS_EXPORT_NAME "${CMAKE_PROJECT_NAME}Targets")
-
 # Export cmake script that can be used by downstream project
 # via `include()`
 export(TARGETS tinyxml2