runtests: add --clay flag to specify compiler
runtests: add --clay flag to specify compiler

jckarter/clay,iamrekcah/clay,iamrekcah/clay,aep/clay,jckarter/clay,jckarter/clay,aep/clay,iamrekcah/clay,aep/clay,mario-campos/clay,mario-campos/clay,aep/clay,iamrekcah/clay,aep/clay,iamrekcah/clay,mario-campos/clay,jckarter/clay,mario-campos/clay,jckarter/clay,jckarter/clay,aep/clay,mario-campos/clay