gcc12 and libreoffice

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

I'm running amd64 built with HAVE_GCC=12.

Trying to build pkgsrc misc/libreoffice with the new native compiler
gives this:

...
[CXX] xmloff/source/xforms/xformsapi.cxx
[CXX] xmloff/source/xforms/xformsexport.cxx
[CXX] xmloff/source/xforms/xformsimport.cxx
[DEP] LNK:Executable/svidl.d
[LNK] Executable/svidl
[DEP] LNK:Library/libdocmodello.so.d
[LNK] Library/libdocmodello.so
[DEP] LNK:Library/libutllo.so.d
[LNK] Library/libutllo.so
ld: /u23/pkgobj/misc/libreoffice/work/libreoffice-24.2.0.3/instdir/program/libcomphelper.so: undefined reference to `std::__cxx11::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const &'
gmake[1]: *** [/u23/pkgobj/misc/libreoffice/work/libreoffice-24.2.0.3/solenv/gbuild/LinkTarget.mk:853: /u23/pkgobj/misc/libreoffice/work/libreoffice-24.2.0.3/workdir/LinkTarget/Executable/svidl] Error 1