dvb.media_addon: Let C++ use C99 math features.

- This get rids of the complain "'UINT64_C' was not declared in this scope" and
  allows us to remove the (now superflous) declaration of UINT64_C.
- No functional change intended.
TV app: Use bilinear filtering.

- This makes the video output looks more visual appealing. Without bilinear
  filtering you would see aliasing artifacts all over the place. Now it looks
  more harmonic.