build swift-inspect for Android as part of toolchain build

[andrurogerz]

Purpose

Include swift-inspect for Android arm64-v8a and x86_64 as part of the Swift toolchain build on Windows.

Overview

• Rework Build-Inspect to support building for targets other than the host
• Update Build-Inspect to use the built sdk rather than the installed one
  • Required adding additional includes and link options to CMAKE_Swift_FLAGS
• Maintain the output location of the swift-inspect binary for the host by special-casing it in Build-Inspect
• Continue to build swift-inspect for the host using the host-built swift-argument-parser
• For non-host builds, Build-Inspect lets CMake fetch swift-argument-parser instead of using the locally built version due to Android requiring v1.5.0 (see [swift-inspect] use CMake FetchContent to fetch ArgumentParser when not provided #78827)
• Build swift-inspect for Android arm64-v8a and x86_64 when those targets are included in the build

Background

• We can now build swift-inspect for Android 64-bit platforms and intend to include it as part of the Android SDK
• Packaging changes to include the swift-inspect binary in the Android .msi files will come later
• When the pinned version of swift-argument-parser moves to >= v1.5.0, the Build-ArgumentParser function should be reworked to build for non-host targets and used when building swift-inspect for non-host targets instead of letting CMake fetch it.

Validation

• Clean + incremental local build using build.ps1 on Windows 11 x64.

rd /s /q S:\b
rd /s /q "S:\Program Files"
rd /s /q S:\Library
S:\SourceCache\swift\utils\build.cmd -Android -IncludeDS2 -DebugInfo -EnableCaching

• Verified the Windows x64 swift-inspect.exe runs on the build machine
• Verified the Android x86_64 swift-inspect runs on an Android emulator
• Verified the Androied arm64-v8a swift-inspect runs on an Android device

[compnerd]

@swift-ci please smoke test