uClibc: 0.9.33.2: Unbreak on avr32 after recent pread patches

avr32 only provides __NR_pread and not __NR_pread64, so the fallback
handling must be used.

Patch sent upstream:
http://lists.uclibc.org/pipermail/uclibc/2013-October/047967.html



Signed-off-by: Peter Korsgaard <peter@korsgaard.com>