This updates the locations searched for the OpenH264 headers to be
consistent with upstream

Discussed here:
https://github.com/cisco/openh264/pull/3415

Due to the change in the pkgconfig file, it is possible to compile with
either:

  #include <openh264/codec_api.h>

OR

  #include <codec_api.h>

but in this patch, I used the former.

Regards,

Daniel

-- 
Debian Developer
https://danielpocock.com