qtbase: add icu
qtbase: add icu

icu is needed to generate the qtwebkit libraries. Poky doesn't have it
by default and then the build will fail later on when an application
tries to use qtwebkit or its widgets.

While not nice, enforce the use of icu in the qtbase bbappend to solve
that.

Signed-off-by: Alexandre Belloni <a7228e626ecf0022ac91fc1cd8db88e71d0e5e0e@free-electrons.com>

koenkooi/meta-atmel,koenkooi/meta-atmel,alexandrebelloni/meta-atmel,linux4sam/meta-atmel,alexandrebelloni/meta-atmel,kraj/meta-atmel,linux4sam/meta-atmel,kraj/meta-atmel,alexandrebelloni/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel,kraj/meta-atmel,koenkooi/meta-atmel