qemu: upgrade to 5.0.0

Among other things, it fixes some bugs w.r.t. symlink loops in the '-L'
option:

  https://git.qemu.org/?p=qemu.git;a=commit;h=f3a8bdc1d5b260d31422edd46360ff849dfbcc93
  util/path: Do not cache all filenames at startup

Retain 'flag-o-matic' (not present upstream) because our bashrc hooks
try to use it.

BUG=chromium:1099508
TEST=build; run ARM unit tests for various packages

Cq-Depend: chromium:2278831, chromium:2284214
Change-Id: Id243a4c90d379dc9221ed16a36744a949f60c253
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2278490
Tested-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
10 files changed