Six module interfaces carry windows.h in their fragment, and a fragment's
include guard does not cross the boundary, so a unit that imported first
and included the SDK afterwards parsed it twice: clang reports it as
conflicting redeclarations of BroadcastSystemMessageEx and mismatched
uuids all through the SDK. Same shape as the basic_filebuf failure, one
level further out - the header arrives through d3d12.h, not directly.
Thirty units get a guarded windows.h ahead of everything; on Linux it is
a no-op. Vendored single-header libraries are left alone, and the block
goes after a BOM rather than before it.
A header first pulled in through an imported module's global module
fragment leaves no include guard in the importing unit - macros do not
cross a module boundary - so a later textual include parses it again and
MSVC rejects the redefinition. Redoes the betterRenderer sweep with
placement that stays out of #if blocks, which is where the previous one
dropped <fstream> and broke nvrenderer_d3d12.cpp.
Its sources reached the standard library through the project headers they
included; those are imports now. 178 headers across 56 files, plus 18 C
library headers elsewhere for memcpy/printf and friends. MSVC's STL does
not supply these transitively the way libstdc++ does.
Verified locally now that Vulkan and DXC are installed: all 31 targets
compile. glm has to come from eu07.glm only - having it both as a plain
include and as an import made every overload ambiguous. nvrenderer.h is
self-sufficient, since register.cpp includes nothing else. Fixes the
vcpkg triplet, which was pinned to x64-windows.
