libcitygml finds only xerces-3, make it find xerces-3.1 as well

FindXerces.cmake.diff

diff --git a/CMakeModules/FindXerces.cmake b/CMakeModules/FindXerces.cmake
index c292ffb..499fbf5 100644
--- a/CMakeModules/FindXerces.cmake
+++ b/CMakeModules/FindXerces.cmake
@@ -18,13 +18,13 @@ ${XERCESC_INCLUDE_DIR}
 PATH_SUFFIXES xercesc
 )
 
-FIND_LIBRARY(XERCESC_LIBRARY NAMES xerces-c_3
+FIND_LIBRARY(XERCESC_LIBRARY NAMES xerces-c_3 xerces-c_3.1
  PATHS
  $ENV{XERCESC_LIBRARY_DIR}
  ${XERCESC_LIBRARY_DIR}
  )
 
- FIND_LIBRARY(XERCESC_LIBRARY_DEBUG NAMES xerces-c_3D
+ FIND_LIBRARY(XERCESC_LIBRARY_DEBUG NAMES xerces-c_3D xerces-c_3.1D
  PATHS
  $ENV{XERCESC_LIBRARY_DIR}
  ${XERCESC_LIBRARY_DIR}
@@ -74,4 +74,4 @@ ELSE(XERCESC_FOUND)
 MESSAGE(FATAL_ERROR "Could not find Xerces-C !")
 ENDIF(XERCESC_FOUND)
 
-MARK_AS_ADVANCED(XERCESC_INCLUDE XERCESC_LIBRARY)
\ No newline at end of file
+MARK_AS_ADVANCED(XERCESC_INCLUDE XERCESC_LIBRARY)