app-editors/emacs: Fix build failure with 17.0 profiles.

app-editors/emacs: Fix build failure with 17.0 profiles.

The following comment from upstream is in configure.ac of emacs-25.3:
"-no-pie or -nopie fixes a temacs segfault on Gentoo, OpenBSD, Ubuntu,
and other systems with "hardened" GCC configurations for some reason
(Bug#18784).  We don't know why this works, but not segfaulting is
better than segfaulting."

Adding -no-pie to 23.4 and 24.5 appears to make them build, too.
Note that only append-ldflags fixes the build failure, while
append-flags does not (at least not for 23.4).

Thanks to Mats Lidell for pointing me to the above upstream comment.

Closes: https://bugs.gentoo.org/639568
Closes: https://bugs.gentoo.org/639570
Package-Manager: Portage-2.3.17, Repoman-2.3.6