libzip: depend on !BR2_STATIC_LIBS

Since version 1.2.0 libzip requires dynamic library capabilities. Add
it to Config.in and propagate this dependency to packages selecting
libzip.

Fixes:

  http://autobuild.buildroot.net/results/c50ffa5bf565e75333192edc89e2d39044d07f26/



Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>