Revert "autotools: symlink where we can"

Revert "autotools: symlink where we can"

This is nice in theory, but there's a risk that a broken source tree could try
to modify the files through the symlinks, screwing up everybody else using
them.  Of course, per-recipe sysroots would resolve this, so we can revisit
this if/when that gets implemented.

This reverts commit 302395545185b4e85bf76a8f319bc71bd3a7be1d.

Signed-off-by: Chris Larson <chris_larson@mentor.com>