libxml2: downgrade to EAPI=4

Current portage does not support EAPI=5 yet.  Strip the features
(which we do not use) that require EAPI=5 so we can use EAPI=4.

BUG=chromium:203253
TEST=`emerge-x86-alex libxml2` works
TEST=`emerge-stumpy libxml2` works
TEST=`emerge-daisy libxml2` works
TEST=`cbuildbot {arm,amd64,x86}-generic-full` works

Change-Id: I4b0955d062d3ec5f67674a644f1e7aeef0218140
Reviewed-on: https://chromium-review.googlesource.com/169480
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed