#481 ensure no softlinks are in repo when building
#481 ensure no softlinks are in repo when building

cp will stop copying if identical files are encountered at the
destination, even when the identical file is in fact a link. To ensure
that this doesn’t break a build, clean the folder before copying.

cortoproject/corto,cortexlang/cortex,cortexlang/cortex,cortexlang/cortex,cortoproject/corto