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Multiple ports: improve regex compliance
These changes largely fall into just two categories:
1. Need textproc/gsed for GNU extensions
2. Extraneous escapes that can go away
For #1, there's a further subdivision into those that require autoconf magic
and those that can get away with BINARY_ALIAS=sed=${LOCALBASE}/bin/gsed.
-CURRENT will soon gain GNU extensions, but these will take longer to get to
all supported releases; we must switch them to gsed to ensure we're actually
properly building them as intended.
For #2, I've fixed these as I can and we should upstream these fixes.
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