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[build] Fix use of inline assembly on GCC 4.8 ARM64 builds
The inline assembly used in include/errno.h to generate the einfo blocks requires the ability to generate an immediate constant with no immediate-value prefix (such as the dollar sign for x86 assembly). We currently achieve this via the undocumented "%c0" form of operand. This causes an "invalid operand prefix" error on GCC 4.8 for ARM64 builds. Fix by switching to the equally undocumented "%a0" form of operand, which appears to work correctly on all tested versions of GCC. Reported-by: Benjamin S. Allen <bsallen@alcf.anl.gov> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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