buildroot: Update to 2017.02.2

This pulls in the 2017.02.1 and 2017.02.2 point releases.

In addition, support for the 4.11 Linux kernel was backported from
master.

Buildroot changelog for the point releases:

 2017.02.2, Released May 1st, 2017

    Important / security related fixes.

    Use HTTPS for the Codesourcery external toolchains as the HTTP
    URLs no longer work.

    Updated/fixed packages: bind, busybox, dovecot, freetype,
    ghostscript, glibc, granite, hiredis, icu, imagemagick,
    gst-plugins-base, gst1-plugins-base, libcroco, libcurl, libnl,
    libnspr, libnss, libsamplerate, libsndfile, libunwind,
    minicom, mplayer, mpv, nodejs, python-django, python-pyyaml,
    python-web2py, samba4, syslinux, systemd, tiff, trinity,
    uboot, wireshark, xen

    Issues resolved (http://bugs.buildroot.org):

    #9791: Python searches for packages in the user site directory

 2017.02.1, Released April 4th, 2017

    Important / security related fixes.

    Fix a variable clashing issue in the mkusers script with
    internal bash variables.

    Improve external toolchain version detection.

    Correct permissions for /dev/pts/ptmx when systemd is used
    with recent glibc versions.

    Fix python module name clash for graph-depends.

    Fakeroot now links against libacl to fix issues on
    distributions using acls.

    Ensure that the git download infrastructure creates GNU format
    tar files.

    br2-external: Improve error reporting.

    Updated/fixed packages: acl, apr, audiofile, busybox, cairo,
    dbus-cpp, dbus-glib, dbus-triggerd, domoticz, elfutils,
    fakeroot, filemq, fmc, gdb, git, gnutls, gst-ffmpeg,
    gst1-plygins-bad, harfbuzz, htop, imagemagick, jasper, libcec,
    libiio, libplatform, librsvg, libselinux, libsidplay2, libsoc,
    libwebsockets, libxkbcommon, linux-firmware, logrotate,
    lpt-testsuite, lttng-libust, mariadb, mbedtls, memcached,
    mesa3d, mpd, mplayer, nbd, ncftp, ntp, openssh, opentyrian,
    pcre, perl-gd, python, qt5base, rpi-userland, rpm, samba4,
    skalibs, slang, sngrep, squashfs, syslog-ng, taglib,
    tcpreplay, tor, upmpdcli, wget, wireshark,
    xdriver_xf86-video-vmware, xlib_libXv, zmqpp

    Issues resolved (http://bugs.buildroot.org):

    #9456: mkusers script bash errors

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/buildroot b/buildroot
index c28573e..23118ce 160000
--- a/buildroot
+++ b/buildroot
@@ -1 +1 @@
-Subproject commit c28573e576611706ffe34819109d3beacb8ff6a8
+Subproject commit 23118cea706cc738c334b868606b19bfda016705