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.

solenv/gbuild/Deliver.mk

@@ -56,11 +56,11 @@ endef
 
 ifeq ($(strip $(gb_Deliver_GNUCOPY)),)
 define gb_Deliver__deliver
-mkdir -p $(dir $(2)) && $(if $(gb_Deliver_CLEARONDELIVER),rm -f $(2) &&) $(if $(gb_Deliver_HARDLINK),ln,cp -f) $(1) $(2) && touch -r $(1) $(2)
+mkdir -p $(dir $(2)) && $(if $(gb_Deliver_CLEARONDELIVER),rm -f $(2) &&) $(if $(gb_Deliver_HARDLINK),ln,cp -P -f) $(1) $(2) && touch -r $(1) $(2)
 endef
 else
 define gb_Deliver__deliver
-mkdir -p $(dir $(2)) && $(gb_Deliver_GNUCOPY) $(if $(gb_Deliver_CLEARONDELIVER),--remove-destination) $(if $(gb_Deliver_HARDLINK),--link) --force --preserve=timestamps $(1) $(2)
+mkdir -p $(dir $(2)) && $(gb_Deliver_GNUCOPY) $(if $(gb_Deliver_CLEARONDELIVER),--remove-destination) $(if $(gb_Deliver_HARDLINK),--link) --no-dereference --force --preserve=timestamps $(1) $(2)
 endef
 endif