Since some of the efi-related packages have been updated in the last few weeks, it seems that this bug is no longer present. I can perform a grub-install with no error messages, and can boot Windows again (woohoo).
This bug can probably be closed, although you might want to check that the return value from efibootmgr is tested, as I noted in the original bug report. .....Ron -- Ron Murray <r...@rjmx.net> PGP Fingerprint: 4D99 70E3 2317 334B 141E 7B63 12F7 E865 B5E2 E761
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