Added 64 bit version of Windows pthreads library

CMakeLists.txt

@@ -89,8 +89,12 @@ IF(WIN32)
         INSTALL(FILES ${lib} DESTINATION "lib/")
     ENDFOREACH(lib)
     LINK_DIRECTORIES("${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}")
-    SET(PTHREADS_LIB pthreadVC2)
-    SET(PTHREADS_LIB_STATIC pthreadVC2_static_mt)
+    IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
+        SET(PTHREADS_LIB pthreadVC2_x64)
+    ELSE(CMAKE_SIZEOF_VOID_P EQUAL 8)
+        SET(PTHREADS_LIB pthreadVC2)
+        SET(PTHREADS_LIB_STATIC pthreadVC2_static_mt)
+    ENDIF(CMAKE_SIZEOF_VOID_P EQUAL 8)
 ELSE(WIN32)
     IF (NOT ANDROID)
         SET(PTHREADS_LIB pthread)