Fixed a cmake compile problem because of the 2.8.8 fix.

configure.cmake

@@ -149,8 +149,9 @@ IF(UNIX)
   SET(CMAKE_REQUIRED_LIBRARIES 
     ${LIBM} ${LIBNSL} ${LIBBIND} ${LIBCRYPT} ${LIBSOCKET} ${LIBDL} ${CMAKE_THREAD_LIBS_INIT} ${LIBRT})
 
-  IF(NOT ${CMAKE_REQUIRED_LIBRARIES} MATCHES '')
-    LIST(REMOVE_DUPLICATES ${CMAKE_REQUIRED_LIBRARIES})
+  LIST(LENGTH CMAKE_REQUIRED_LIBRARIES required_libs_length)
+  IF(${required_libs_length} GREATER 0)
+    LIST(REMOVE_DUPLICATES CMAKE_REQUIRED_LIBRARIES)
   ENDIF()  
   LINK_LIBRARIES(${CMAKE_THREAD_LIBS_INIT})