Fix detecting VDPAU on dash-based systems.
Fix detecting VDPAU on dash-based systems.

The script was using 'echo -e' which is not POSIX-compliant. The
recommendation is to use printf with string containing escape sequences.

ttill/MLT,mltframework/mlt,gmarco/mlt-orig,zzhhui/mlt,wideioltd/mlt,siddharudh/mlt,gmarco/mlt-orig,anba8005/mlt,xzhavilla/mlt,mltframework/mlt,wideioltd/mlt,siddharudh/mlt,zzhhui/mlt,siddharudh/mlt,wideioltd/mlt,wideioltd/mlt,siddharudh/mlt,mltframework/mlt,mltframework/mlt,wideioltd/mlt,gmarco/mlt-orig,ttill/MLT-roto,ttill/MLT-roto,ttill/MLT,anba8005/mlt,ttill/MLT-roto,ttill/MLT-roto,ttill/MLT-roto,ttill/MLT-roto-tracking,wideioltd/mlt,ttill/MLT,ttill/MLT,j-b-m/mlt,xzhavilla/mlt,j-b-m/mlt,anba8005/mlt,mltframework/mlt,xzhavilla/mlt,j-b-m/mlt,zzhhui/mlt,j-b-m/mlt,mltframework/mlt,xzhavilla/mlt,ttill/MLT-roto-tracking,ttill/MLT-roto-tracking,anba8005/mlt,anba8005/mlt,wideioltd/mlt,xzhavilla/mlt,ttill/MLT-roto-tracking,ttill/MLT-roto-tracking,anba8005/mlt,ttill/MLT,siddharudh/mlt,wideioltd/mlt,ttill/MLT-roto-tracking,j-b-m/mlt,gmarco/mlt-orig,ttill/MLT-roto,anba8005/mlt,ttill/MLT-roto,zzhhui/mlt,ttill/MLT-roto-tracking,anba8005/mlt,siddharudh/mlt,j-b-m/mlt,ttill/MLT-roto,xzhavilla/mlt,gmarco/mlt-orig,anba8005/mlt,siddharudh/mlt,xzhavilla/mlt,ttill/MLT,zzhhui/mlt,mltframework/mlt,gmarco/mlt-orig,ttill/MLT-roto-tracking,ttill/MLT,ttill/MLT-roto-tracking,ttill/MLT-roto,zzhhui/mlt,siddharudh/mlt,mltframework/mlt,j-b-m/mlt,ttill/MLT,j-b-m/mlt,zzhhui/mlt,gmarco/mlt-orig,wideioltd/mlt,ttill/MLT,mltframework/mlt,j-b-m/mlt,mltframework/mlt,zzhhui/mlt,xzhavilla/mlt,j-b-m/mlt,siddharudh/mlt,xzhavilla/mlt,zzhhui/mlt,gmarco/mlt-orig,gmarco/mlt-orig