Three issues when linking the static library with the MSVC linker:
Use the LLVM backend on Windows to produce valid COFF objects.
The self-hosted backend generates compiler_rt objects with invalid
COMDAT sections that the MSVC linker rejects (LNK1143).
Disable bundling ubsan_rt on Windows. Zig's ubsan runtime emits
/exclude-symbols linker directives that MSVC does not understand
(LNK4229).
Add ntdll and kernel32 as transitive link dependencies for the
static library on Windows. The Zig standard library uses NT API
functions (NtClose, NtCreateSection, etc.) that consumers must
link.
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