gptfdisk: reinstate ldlibs support patch

I removed that in fac3042c because the
ICU part was no longer required.
However the LDLIBS part is for static builds and should have been a
separate patch to avoid confusion. Fixes:
http://autobuild.buildroot.net/results/a90/a9092d01a71e2d799e5b7b3afb9fd3e304370d0c/



Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>