rebar compile eunit compile_only=true fails for yaws
rebar compile eunit compile_only=true fails for yaws

Changes to allow yaws to be compiled by rebar for eunit testing.  This
change is helpful when embedding yaws as a dependency of an Erlang
application.

andreineculau/yaws,namjae/yaws,bsmr-erlang/yaws,klacke/yaws,weisslj/yaws,imtal/yaws,imtal/yaws,namjae/yaws,ca91/yaws,sebgod/yaws,andreineculau/yaws,ca91/yaws,watonyweng/yaws,imtal/yaws,sebgod/yaws,imtal/yaws,phonohawk/yaws,bsmr-erlang/yaws,sebgod/yaws,ca91/yaws,imtal/yaws,watonyweng/yaws,toraritte/azith,weisslj/yaws,capflam/yaws,leoliu/yaws,sebgod/yaws,imtal/yaws,phonohawk/yaws,weisslj/yaws,watonyweng/yaws,zephyrean/yaws,weisslj/yaws,watonyweng/yaws,leoliu/yaws,klacke/yaws,klacke/yaws,leoliu/yaws,ca91/yaws,bsmr-erlang/yaws,namjae/yaws,patternmatched/yaws,patternmatched/yaws,toraritte/azith,sebgod/yaws,bsmr-erlang/yaws,capflam/yaws,patternmatched/yaws,klacke/yaws,capflam/yaws,toraritte/azith,weisslj/yaws,patternmatched/yaws,toraritte/azith,phonohawk/yaws,bsmr-erlang/yaws,toraritte/azith,leoliu/yaws,zephyrean/yaws,phonohawk/yaws,andreineculau/yaws,leoliu/yaws,imtal/yaws,patternmatched/yaws,klacke/yaws,leoliu/yaws,bsmr-erlang/yaws,klacke/yaws,sebgod/yaws,ca91/yaws,toraritte/azith,zephyrean/yaws,leoliu/yaws,watonyweng/yaws,sebgod/yaws,watonyweng/yaws,capflam/yaws,ca91/yaws,phonohawk/yaws,patternmatched/yaws,capflam/yaws,andreineculau/yaws,klacke/yaws,zephyrean/yaws,weisslj/yaws,toraritte/azith,namjae/yaws,phonohawk/yaws,capflam/yaws,namjae/yaws,zephyrean/yaws,patternmatched/yaws,zephyrean/yaws,bsmr-erlang/yaws,zephyrean/yaws,namjae/yaws,weisslj/yaws,watonyweng/yaws,andreineculau/yaws,phonohawk/yaws,namjae/yaws,ca91/yaws,capflam/yaws