cad/freecad: Fix build with LLVM 19

Import patch to fix build

Source:
https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-freecad/001-clang19-char-traits.patch

PR: 284096
Reported by: Keith White <kwhite.uottawa@gmail.com>
Reviewed by: diizzy
Approved by: portmgr (maintainer timeout, 4+ weeks)