ODROID-C5: add new build extention 'aml_library_sources_ifndef'

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Change-Id: I0b4b90b26d97cf546b35332a8ad90d106e561796
diff --git a/cmake/extensions.cmake b/cmake/extensions.cmake
index 04bdbe7..35b0d43 100755
--- a/cmake/extensions.cmake
+++ b/cmake/extensions.cmake
@@ -687,6 +687,12 @@
   endif()
 endfunction()
 
+function(aml_library_sources_ifndef feature_toggle source)
+  if(NOT ${feature_toggle})
+    aml_library_sources(${source} ${ARGN})
+  endif()
+endfunction()
+
 function(aml_sources_ifdef feature_toggle)
   if(${${feature_toggle}})
     aml_sources(${ARGN})