not compatible with v2.2.0

[hamlatzis]

In v2.2.0 of kvazaar lib the struct roi inside kvz_config doesn't have an element of width or height; but there is a struct roi with those elements inside struct kvz_picture

So if you try to compile gst-kvazaar with the latest version you get compile errors:

../src/gstkvazaarenc.c: In function ‘gst_kvazaar_enc_init_encoder’:
../src/gstkvazaarenc.c:1240:32: error: ‘struct <anonymous>’ has no member named ‘width’
     encoder->kvazaarconfig->roi.width = encoder->roi_width;
                                ^
../src/gstkvazaarenc.c:1241:32: error: ‘struct <anonymous>’ has no member named ‘height’
     encoder->kvazaarconfig->roi.height = encoder->roi_height;
                                ^
../src/gstkvazaarenc.c:1242:32: error: ‘struct <anonymous>’ has no member named ‘dqps’
     encoder->kvazaarconfig->roi.dqps = encoder->dqps;