for each $MACHINE_ARCH we have compat libraries to build for, give a list
of ABIs to target. for amd64 and sparc64, we use the old i386 and sparc
subdirectories. for mips64, we build both o32 and n

for each $MACHINE_ARCH we have compat libraries to build for, give a list
of ABIs to target. for amd64 and sparc64, we use the old i386 and sparc
subdirectories. for mips64, we build both o32 and n64 libraries.

these files are not yet used, but will be shortly.

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