Add executables from ANDROID_HOME to the PATH

[dfabulich]

Fixes #630

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I manually uninstalled android-platform-tools to repro #630. I passed the build log to Cursor, which found the issue and generated this code. I reviewed the lines and tested it locally, ensuring that it fixed my local build.

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[marcprux]

Thanks. I had assumed that skiptools/skipstone#184 addressed this, but it looks like I never removed the Homebrew adb command from my PATH, and so I didn't see the failure.

As some point we should probably put the adb command launch behind skip adb so tool path handling is unified, but ADBCommand.swift is currently experimental and untested.