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doc: fix C++ example compilation on MinGW

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/ex-cxx into master

The examples under doc/examples/ are compiled with Gnulib, which overrides write if it's not available, as a macro. This conflicts with the usage of std::iostream::write in ex-cxx.cpp. To avoid the build issue, use a custom namespace to hide it, as suggested in: https://www.gnu.org/software/gnulib/manual/html_node/A-C_002b_002b-namespace-for-gnulib.html

Fixes: #1480 (closed)

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated / NEWS entry present (for non-trivial changes)
  • CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTION.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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