add h264. Should hopefully be good for now. not going to push docker build until fully tested.

Overlord-Client/cmd/agent/capture/h264_encoder_stub.go

@@ -0,0 +1,18 @@
+//go:build !cgo
+
+package capture
+
+import (
+	"errors"
+	"image"
+)
+
+func encodeH264Frame(_ *image.RGBA) ([]byte, error) {
+	return nil, errors.New("h264 support not available (cgo disabled)")
+}
+
+func h264Available() bool {
+	return false
+}
+
+func resetH264Encoder() {}