Remove the make integration

[UnstoppableMango]

Remove the make stuff for now. It doesn't work, and it makes the build more confusing.

[Copilot]

Pull request overview

This PR removes the make integration functionality from the project. The integration attempted to provide GNU make plugin functionality but was non-functional and complicated the build process.

Key changes:

• Removed all make integration source code from pkg/make/ directory
• Removed the github.com/unmango/gnumake-go dependency from Go modules
• Updated the Makefile to remove make plugin build targets

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/make/mk_funcs/main.go	Deleted Go plugin loader for GNU make integration
pkg/make/mk_funcs/gpl.c	Deleted GPL compatibility marker required for make plugins
pkg/make/mk_funcs.go	Deleted make function implementations
pkg/make/make.go	Deleted make-related constants and types
go.mod	Removed github.com/unmango/gnumake-go dependency
go.sum	Removed checksums for the gnumake-go dependency
Makefile	Removed -load bin/mk_funcs.so directive and bin/mk_funcs.so build target
pkg/renovate/zz_generated.schema.go	Auto-generated Renovate schema updates (unrelated to make removal - appears to be from schema regeneration)

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