Kiln 1.2.0

A 32-bit Windows target

Kiln could cross-build for Windows x64; it can now cross-build for 32-bit Windows
too, with --os windows --arch x86.

On that target a c-record's pointer-sized fields are four bytes rather than
eight, and a system declaration is stdcall, which is what a Win32 call is
there. The win kit's declarations follow the pointer width, so the same
declarations serve both targets instead of one set per architecture.

• Console programs and libraries cross-build for --os windows --arch x86 with
  the matching mingw toolchain installed, and are tested under wine.
• A 32-bit windowed program is not built yet. The vendored UI stack (RmlUi,
  SDL2, FreeType) is x86-64 only, and --arch x86 with --target gui is refused
  by name rather than attempted.
• Nothing a 1.1.0 program can see changes: the same source builds the same
  x86-64 binary it did, byte for byte.

Minor, not major, by the promise in the README: a new target, and no language or
ABI change — KILN_ABI_VERSION stays at 4.

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Published after the fact: this version was tagged on 2026-09-12 and the release
was cut later, from the tag itself.