added '(*synthesize*)' to tests/aecho/Echo.bsv (forgot to add in previous commit)
added '(*synthesize*)' to tests/aecho/Echo.bsv (forgot to add in previous commit)

hanw/connectal,chenm001/connectal,cambridgehackers/connectal,chenm001/connectal,cambridgehackers/connectal,cambridgehackers/connectal,csail-csg/connectal,hanw/connectal,cambridgehackers/connectal,csail-csg/connectal,hanw/connectal,cambridgehackers/connectal,csail-csg/connectal,csail-csg/connectal,chenm001/connectal,chenm001/connectal,chenm001/connectal,hanw/connectal,csail-csg/connectal,hanw/connectal