0fbf051fec723f86f49ab14ea15c91bb1435c656 depends: fix BDB compilation on OpenBSD (Sebastian Falbesoner)
Pull request description:
Compiling C++ code with `-D_XOPEN_SOURCE=600` causes problems on OpenBSD. If that define is set, the C++ standard header detection routine in BDB's configure script fails due to a missing type name for `locale_t` (see https://gist.github.com/theStack/b41884e31ebc5cdca3220bcaa674cb70 for the relevant config.log part).
This results in `HAVE_CXX_STDHEADERS` not being defined, which then it turn leads to the inclusion of `<iostream.h>` (rather than `<iostream>`), which doesn't exist, as described in #28963.
According to a mailing list post discussing a similar problem [1], "OpenBSD provides the POSIX APIs by default", so we don't need this define anyway and can remove it. This fixes the BDB build problem as described in issue #28963. See also f87e75ae71 for a similar fix for google's flatbuffer project.
Tested on OpenBSD 7.4 with clang 13.0.0. Fixes#28963.
[1] https://www.mail-archive.com/tech@openbsd.org/msg63386.html
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