vlc: disable on ARC

This package fails when building for ARC due to ARC toolchain issue.

Marking this with special comment "# ARC toolchain issue" as the package
is to be enabled as soon as the issue with the ARC toolchain is
resolved.

Fixes:

  http://autobuild.buildroot.net/results/ebae0ed90b88db5a3b34a46f2ca1ff97e01fe83c/



Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>
[Thomas:
 - add autobuilder reference
 - propagate dependency to Config.in comment.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>