aiccu: disable for uClibc 0.9.31/0.9.32

aiccu uses the dn_skipname() function, which was only introduced in
uClibc 0.9.33. Therefore, we disable this package when uClibc 0.9.31
and 0.9.32. Most likely, only AVR32 users will be affected by this, so
we don't add a specific kconfig comment for that.

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