buildroot

package/icu: bump version to 59.1

According to the release notes "Compiler support for C++11 is now
required for building the ICU libraries.
GCC: version 4.8 and later has been tested."

Added corresponding dependencies and reverse dependencies.
Removed patch 0006 applied upstream.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>