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dotnet: force PlatformTarget=AnyCPU to fix arm64 host load failure (#9868)

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`Microsoft.Z3.dll` was being emitted with PE `Machine=0x8664` (AMD64)
despite being pure IL, because the Windows x64 CI environment
(`vcvarsall.bat x64`) injects `Platform=x64` into MSBuild, which sets
the COFF machine type when `PlatformTarget` is not explicitly specified.
This causes `FS0193` / architecture mismatch errors on any arm64 .NET
host (macOS Apple Silicon, Linux aarch64, Windows on ARM).

## Changes

- **`scripts/mk_util.py`** — Add
`<PlatformTarget>AnyCPU</PlatformTarget>` to the in-memory `.csproj`
template generated by the Python build system (`mk_win_dist.py`,
`mk_unix_dist.py`)
- **`src/api/dotnet/Microsoft.Z3.csproj.in`** — Add
`<PlatformTarget>AnyCPU</PlatformTarget>` to the CMake build system
template

Both paths now produce `Machine=0x014C` (i386/AnyCPU) regardless of host
or CI environment, matching the assembly's actual nature (`ILONLY=True`,
`32BIT_REQUIRED=False`). The native side already ships six RIDs; no
changes needed there.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
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Copilot 2026-06-16 09:52:04 -06:00 • committed by GitHub
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@ -1804,6 +1804,7 @@ class DotNetDLLComponent(Component):
<Description>Z3 is a satisfiability modulo theories solver from Microsoft Research.</Description>
<Copyright>Copyright Microsoft Corporation. All rights reserved.</Copyright>
<PackageTags>smt constraint solver theorem prover</PackageTags>
<PlatformTarget>AnyCPU</PlatformTarget>
%s
</PropertyGroup>