[SyncEvolution] Fails to build with boost 1.73.0

[Milan Crha]

	Hi,
I'm rebuilding SyncEvolution 1.5.3 under Fedora Rawhide (to be Fedora 33),
which has boost 1.73.0 and this boost version has changed behavior of
the bind.hpp, as shown in the build log:

   In file included from /usr/include/boost/bind.hpp:30,
                    from ./src/syncevo/GLibSupport.h:41,
                    from src/syncevo/ForkExec.h:30,
                    from src/syncevo/ForkExec.cpp:20:
   /usr/include/boost/bind.hpp:36:1: note: '#pragma message: The
   practice of declaring the Bind placeholders (_1, _2, ...) in the
   global namespace is deprecated. Please use <boost/bind/bind.hpp> +
   using namespace boost::placeholders, or define
   BOOST_BIND_GLOBAL_PLACEHOLDERS to retain the current behavior.'
      36 | BOOST_PRAGMA_MESSAGE(

The above is only a message, which leads to a build break later in the
sources:

   src/syncevo/Cmdline.cpp: In member function 'bool SyncEvo::Cmdline::run()':
   src/syncevo/Cmdline.cpp:1426:65: error: '_1' was not declared in this scope
    1426 |             processLUIDs(source, boost::bind(ShowLUID, logging, _1));

Declaring the BOOST_BIND_GLOBAL_PLACEHOLDERS mutes the message, but it
doesn't fix the build.

I'd propose a patch, but I do not know a single bit of the boost
library. I'm sorry.

	Bye,
	Milan
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