r20901: - not all compiler like uint8_t data[0] elements!

r20901: - not all compiler like uint8_t data[0] elements!
- this fix looks really ugly but I don't know a better solution...

if we would use uint8_t *data; then we would send the pointer value
also in the network packet and we would need to initialize

s->data = ((void *)(&s->data) + 1;

to make the memcpy statements work as they're currently,
so we use uint8_t data[1] in the struct definition ...

tridge: please review careful!

hopefully fix the build on solaris and HPUX

metze
(This used to be commit 015097677c8a65e9f5a4367f4f89193a4b2de76b)