boost 1.8.1 beta1+gcc-12: multiple definition of `boost::phoenix::placeholders::uarg1'

Hi,

I tried to recompile [freeorion](https://github.com/freeorion/freeorion) v0.4.10.2 with boost 1.81.0.beta1. The linking step run into this problem (stripped duplicated (in meaning) errors):

> /usr/bin/ld: CMakeFiles/freeorionparseobj.dir/parse/VisibilityValueRefParser.cpp.o:(.bss+0x12): multiple definition of `boost::phoenix::placeholders::uarg1'; CMakeFiles/freeorionparseobj.dir/parse/ArithmeticRules.cpp.o:(.bss+0x12): first defined here

It seems like the `boost::phoenix::placeholders::uarg1` (and friends) is allocated in bss in all translation unit that include `boost/phoenix.hpp`

Is it intended?

fwiw, the same code can be linked with gcc 10 and boost 1.80