Darwin, CTF, BTF: Do not run the DWARF debug link for BTF/CTF [PR101283].

Darwin, CTF, BTF: Do not run the DWARF debug link for BTF/CTF [PR101283].

Darwin uses an efficient two-stage process for debug linking.
The static linker (ld64) notes the inputs required but does not
link the debug.  When required / on demand the debug is linked
into a separate package by the debug linker (dsymutil).  At
present none of the Darwin tools consume or understand BTF/CTF.
The static linker silently accepts the sections (but will not
act on them as containing anything to be processed).

However, the debug linker produces a warning that it has been
presented with input with no [DWARF] debug content:
warning: no debug symbols in executable (-arch x86_64).

This causes several testsuite fails with excess errors.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
PR debug/101283 - Several tests fail on Darwin with -gctf/gbtf

	PR debug/101283

gcc/ChangeLog:

	* config/darwin.h (DSYMUTIL_SPEC): Do not try to run
	dsymutil for BTF/CTF.