Learned from other AltPkg implementations to create a truly minimal patch:
- Moved from 2073-line overlay to 127-line hasAltPkg implementation
- Replaced internal package dependencies:
* internal/buildcfg → runtime.GOARCH/GOOS
* internal/goversion → hardcoded constant (24)
* internal/platform.CgoSupported → simplified implementation
* internal/buildcfg.ToolTags → simplified buildToolTags()
- Used type alias (Context = build.Context) to reference stdlib types
- Added go/build to hasAltPkg map
- Removed overlay entirely
This follows the pattern used by other AltPkg packages and achieves
the minimal patching approach requested.
Demo verified working with llgo.
Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: luoliwoshang <luoliwoshang@users.noreply.github.com>
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