Migrating to EAPI 2 and econf

Just a reminder to everyone that when you migrate to EAPI 2 in order to use use dependencies remember to migrate your src_compile function too or you will be running econf twice if you have a custom src_compile function. econf will first be run by the default src_configure function and then by your custom src_compile function. Hopefully we will get a QA check for this in the near future.