gbuild: Deliver.mk: preserve symlinks on deliver
gbuild: Deliver.mk: preserve symlinks on deliver

The option -P seems to be supported by a lot of ancient cp
implementations, let's hope it actually works.

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core