pinentry: enable _XOPEN_SOURCE on musl for wchar usage in curses
This is defined for glibc automatically with _GNU_SOURCE but not for musl Signed-off-by:Khem Raj <raj.khem@gmail.com> Signed-off-by:
Luca Ceresoli <luca.ceresoli@bootlin.com> Signed-off-by:
Richard Purdie <richard.purdie@linuxfoundation.org>
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