outmacho: use section table lookup for local symbol references
outmacho: use section table lookup for local symbol references

When generating local symbol references, don't loop over all the
sections like we used to...

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm