abuild: do not try to strip standalone elf images
Guile uses ELF is internal object format, and creates them as "no machine" and "standlone" OSABI. Scanelf supports printing OSABI, so use that to filter these out. See: https://github.com/alpinelinux/aports/pull/1714 This also removes unneccessary 'sed' from the pipeline as it's simple to read each field outputted by scanelf.
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