Manual build fails on macOS with modern Go (invalid reference to syscall.recvmsg)

[s41r4j]

Steps to reproduce (from README):
- git clone https://github.com/pwnesia/dnstake
- cd dnstake/cmd/dnstake
- go build .

Build fails with: link: golang.org/x/net/internal/socket: invalid reference to syscall.recvmsg
(seen on macOS/darwin arm64 with newer Go toolchains).

In restricted/sandboxed environments it can also fail earlier with “operation not permitted”
trying to write Go caches under the default GOCACHE/GOMODCACHE paths.

• Root cause:
  • The dependency tree pulls very old golang.org/x/net / golang.org/x/sys versions (2019-era)
    that don’t link correctly with current Go on macOS.
  • Some environments don’t allow writing to the default Go cache/module cache directories.
• Proposed fix:
  • Update/pin deps in go.mod (and regenerate go.sum) to newer compatible versions, e.g.
    golang.org/x/net v0.35.0 and golang.org/x/sys v0.30.0, and bump the module go version to at
    least 1.18.
  • Update README manual build steps to build from repo root: go build ./cmd/dnstake.
  • Document a cache workaround for sandboxed builds, e.g. GOCACHE="$PWD/.cache/go-build"
    GOMODCACHE="$PWD/.cache/gomod" go build ./cmd/dnstake, and ignore .cache/ in .gitignore.
• Expected result:
  • go build succeeds on macOS with current Go versions following the README steps.

(Can work for diff linux as well!)