net-misc/curl: version bump to 7.51.0, bug #597760

Cherry pick from upstream with trivial modifications:
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=afa2aaba543bc2beec2465256d2a0907dc9d69e8

BUG=chromium:661562
TEST=emerge-$BOARD -v1 curl && emerge-$BOARD -v1 $(equery-$BOARD d curl | awk '{ print "=" $1 }')

Change-Id: I13d2a8424be45c7cf11f2a744a1d248601f1c40d
Reviewed-on: https://chromium-review.googlesource.com/406987
Commit-Ready: Mattias Nissler <mnissler@chromium.org>
Tested-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
2 files changed