Update arm sysroot image used by arm/linux builder.

This brings in the new libpcap2 package which was added
to the build script here:
https://codereview.chromium.org/51323006/

Also, remove support for install armel sysroot now that
all the builders are on armhf.

BUG=312380
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/55233006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232816 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed