flac: fix universal build

Fixes #34589.
i2util 1.2 (new formula)

This is a dependency for owamp-3.4 and bwctl

Note: i2util includes binaries "aespasswd" and "pfstore" which were
previously in owamp-3.3, and therefore will generate link conflicts
with that package.
i2util: add 1.2 bottle.