[c86 libc] Ensure no data has address zero #2168
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Uses AS86 pseudo op change in ghaerr/8086-toolchain#27.
In startup code, ".sect 1" is used to force 4 bytes of zeroes to be allocated by LD86 before the normal .data segment. This in turn allows for C86-generated static data to never be assigned address zero.
Removes previous vprintf null pointer display hack for C86.