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Workaround for a warning in a Boost spirit header

Marco Clemencicrequested to merge
clemenci-master-patch-f2b8 into master

This is a port of gaudi/Gaudi!1476 (77ed9947) to work around the warning

include/boost/spirit/.../real_impl.hpp:337:45: warning: 'n' may be used uninitialized [-Wmaybe-uninitialized]
  337 |             traits::assign_to(traits::negate(neg, n), attr);
      |                               ~~~~~~~~~~~~~~^~~~~~~~

Note that the warning is not visible in the nightly builds because we ignore warnings coming from Boost in the reports, but it's very annoying in interactive builds.

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