sys-devel/crossdev: bump up to 20180918

sys-devel/crossdev: bump up to 20180918

Single new patch:
https://gitweb.gentoo.org/proj/crossdev.git/commit/?id=a23e6057c94403e010a4ccd06091b59cc332e593

"""
crossdev: don't enable USE=pie by default on any bare-metal targets

Unfortunately embedded world has a long way to go
to adopt --enable-default-pie as a first class citizen.

Note:
  --enable-default-pie enabled two things:
    - PIC-friendly code generation (-fPIE)
    - PIE executables (-pie)

  Normally one would expect firmware to pass compiler modes explicitly
  to gcc: -fPIC (or -mauto-pic, -fno-PIC), -ffreestanding, -nostdlib.

  Unfortunately upstreams are frequently reluctant to explicitly specify
  new moving parts available in gcc (in this case -no-pie) and expect
  gcc to behave as it used to in the world before --enable-default-pie.
  Unfortunate but not entirely unreasonable.

Disable --enable-default-pie until user explicitly requests USE=pie.
"""

Reported-by: Bertrand Jacquin
Reported-by: sklv
Bug: https://lists.gnupg.org/pipermail/gnuk-users/2018-August/000086.html
Bug: https://github.com/gl-sergei/u2f-token/issues/14
Package-Manager: Portage-2.3.49, Repoman-2.3.10