FreeBSD/poudriere b338f20src/poudriere-sh mapfile.c, src/share/poudriere/include util.sh

mapfile: Treat stdout/stderr special.

Don't open these, just write to them directly. This
allows redirects to work as expected.
DeltaFile
+27-1src/poudriere-sh/mapfile.c
+25-0test/mapfile.sh
+1-1src/share/poudriere/include/util.sh
+53-23 files

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