Revert "FROMLIST: kheaders: dereferences the source tree"

This reverts commit 28fa7afc.

It causes conflicts with upstream merge and is no longer applicable.
Instead the equivalent --dereference flag for tar will be added in a
separate ANDROID commit.

Cc: Yifan Hong <elsk@google.com>
Change-Id: I08c6b50eb7f450be0fcf61cea8040b76c954b3ed
Signed-off-by: Carlos Llamas <cmllamas@google.com>