[PATCH 0/3] MR8193: Support generating both DWARF and PDB debug info in a single build.

[Jacek Caban (＠jacek)]

This adds support for `CROSSDEBUG="dwarf pdb"` (or the equivalent `CROSSCFLAGS`) to enable embedding DWARF debug info alongside PDB files, as well as `CROSSDEBUG="split-dwarf pdb"` to generate both split DWARF and PDB files from a single Clang-based build. This makes it easier to produce a Wine build that can be debugged using both Windows and Unix tools.