try to fix shared object issue.

contrib/irrXML/CMakeLists.txt

@@ -13,7 +13,7 @@ if ( MSVC )
   ADD_DEFINITIONS( -D_CRT_SECURE_NO_WARNINGS )
 endif ( MSVC )
 
-add_library(IrrXML SHARED ${IrrXML_SRCS})
+add_library(IrrXML ${IrrXML_SRCS})
 set(IRRXML_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}" CACHE INTERNAL "IrrXML_Include" )
 set(IRRXML_LIBRARY "IrrXML" CACHE INTERNAL "IrrXML" )