fixed typo in CMakeLists.txt 'Udunits to udunits

CMakeLists.txt

@@ -104,7 +104,7 @@ if(CMOR_ROOT)
   find_package(CMOR)
   if(TARGET CMOR::CMOR)
     list(APPEND cdo_compile_definitions "HAVE_LIBCMOR=1")
-    target_link_libraries(operators PUBLIC CMOR::CMOR Uuid::uuid json-c Udunits)
+    target_link_libraries(operators PUBLIC CMOR::CMOR Uuid::uuid json-c udunits)
   endif()
 endif()
 #  ----------------------------------------------------------------------