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git2svn
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2021-05-05T08:26:31.639001Z
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pw(8): use open_memstream(3) instead of sbuf(9)

open_memstream(3) is a standard function that brings here the same
functionnality what we were doing with sbuf(9).

(cherry picked from commit 0cd4b781a6fa1ed4ca04a7b642f41652e25bbc9b)

Git Hash:   432610226b1ca188c5e7a7029e4852a5ad00edf5
Git Author: bapt@FreeBSD.org
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