cmake HAVE_LTDL_LIB examples

mongodb/mongo-bi-connector-odbc-driver cmake/FindLtdl.cmake :47 

CHECK_LIBRARY_EXISTS(ltdl lt_dlopen "" HAVE_LTDL_LIB)

mongodb/mongo-bi-connector-odbc-driver cmake/FindLtdl.cmake :51 

ENDIF(NOT HAVE_LTDL_LIB)