don't use protoc

[todo]

pout/internal/proto/registry/registry.go

Lines 20 to 25 in a68fd06

	// TODO: don't use protoc
	func createProtoRegistry(srcDir string, filename string) (*protoregistry.Files, error) {
	// Create descriptors using the protoc binary.
	// Imported dependencies are included so that the descriptors are self-contained.
	tmpFile := path.Base(filename) + "-tmp.pb"
	cmd := exec.Command("protoc",

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This issue was generated by todo based on a TODO comment in a68fd06. It's been assigned to @aakarim because they committed the code.