opendbc needs cereal

Author: geohot

can/SConscript

@@ -1,4 +1,4 @@
-Import('env')
+Import('env', 'cereal')
 
 import os
 from opendbc.can.process_dbc import process
@@ -23,6 +23,6 @@ env.Command(['packer_impl.so'],
 
 # parser
 env.Command(['parser_pyx.so'],
-  [libdbc, 'parser_pyx_setup.py', 'parser_pyx.pyx', 'common.pxd'],
+  [libdbc, cereal, 'parser_pyx_setup.py', 'parser_pyx.pyx', 'common.pxd'],
   "cd opendbc/can && python3 parser_pyx_setup.py build_ext --inplace")