Revert "libctf: fix linking of non-root-visible types"

Revert "libctf: fix linking of non-root-visible types"

This reverts commit 87b2f673102884d7c69144c85a26ed5dbaa4f86a.

It is based on a misconception, that hidden types in the deduplicator
input should always be hidden in the output.  For cu-mapped links,
and final links following cu-mapped links, this is not true: we want
to hide inputs if they were conflicting on the output and no more.

We will reintroduce the testcase once a better fix is found.

libctf/
	PR libctf/33047
	* ctf-dedup.c (ctf_dedup_emit_type): Don't respect the nonroot flag.
	* testsuite/libctf-writable/ctf-nonroot-linking.c: Removed.
	* testsuite/libctf-writable/ctf-nonroot-linking.lk: Removed.