Upgrade libxml2 and its portage dependencies

Upgrade dev-libs/libxml2-2.7.3-r2 to dev-libs/libxml2-2.7.8
Upgrade app-admin/eselect-python-20091230 to app-admin/eselect-python-20100321
Upgrade sys-libs/readline-6.0_p4 to sys-libs/readline-6.1_p2
Upgrade sys-libs/zlib-1.2.3-r1 to sys-libs/zlib-1.2.5-r2

BUG=chromium-os:10373
TEST=x86 and arm: build_packages, build_image, ran suite_Smoke for x86

Change-Id: Ic36959dbd40fc4aed23dfc4c2072402617976638

Review URL: http://codereview.chromium.org/6776028
38 files changed
tree: 12eb20c705b739b3bf9061f09db00b94544ba3a8
  1. app-admin/
  2. dev-libs/
  3. sys-libs/
  4. inherit-review-settings-ok