ld: Append LDFLAGS to flags variable in default_ld_link

ld: Append LDFLAGS to flags variable in default_ld_link

The following change is needed to fix errors trying to load the
milli.a archive for the hppa*64*-*-hpux* target when the host
system isn't hpux.

We need to create a dummy milli.a archive for this target and
append the directory of this archive to LDFLAGS.

This assumes the testsuite takes the LDFLAGS environment variable
into account.  However, some tests in the ld testsuite use the
low-level `ld-link' procedure and it fails to take LDFLAGS into
account.

This change modifies the `default_ld_link' procedure to append
$LDFLAGS to the flags variable and fix the above issue.

This change potentially affects the `alpha*-*-*vms*' target but
currently no tests run for it make direct use of `ld-link'.

Suggested-by: Maciej W. Rozycki <macro@orcam.me.uk>
2026-04-27  John David Anglin  <danglin@gcc.gnu.org>

ld/ChangeLog:

	* testsuite/lib/ld-lib.exp (default_ld_link): Append
	LDFLAGS to `flags' variable.  Also use the append command
	to append the board flags.