Update strongSwan lenient encryption to upstream

Use the upstream version of the lenient-encryption patch, which
puts this functionality behind a flag.

CQ-DEPEND=CL:195408
BUG=chromium:334620
TEST=authenticate to SonicWall VPN with XAUTH.

Change-Id: I28e18ddfa1e8e932f4dc459b0df895dd306af5f9
Reviewed-on: https://chromium-review.googlesource.com/196731
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
2 files changed