testing/conntracct: patch CGO_ENABLED

part of #15809 (closed)

>>> conntracct: dont-run-setcap.patch
patching file magefile.go
-buildmode=pie requires external (cgo) linking, but cgo is not enabled
Error: running "go build -o build/conntracct" failed with exit code 1
>>> ERROR: conntracct: build failed