* boot/i386/pc/cdboot.S: Use LOCAL for local labels. Eliminate
ABS and APPLE_CC.
* boot/i386/pc/diskboot.S: Likewise.
* boot/i386/pc/lnxboot.S: Likewise. Hardcode the number of code
sectors allow compilation on MacOSX.
* conf/i386-pc.rmk: Enable unconditional compilation of
lnxboot.img.
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