qmmp: Follow reformation of ffmpeg family r330911

v2.0.x: multimedia/ffmpeg2, SUFFIX=2
        --> multimedia/ffmpeg, SUFFIX=

devel:  multimedia/ffmpeg-devel, SUFFIX=-devel
         not changed

v1.1.x: multimedia/ffmpeg1, SUFFIX=1
         not changed

v0.7.x: At any of multimedia/ffmpeg0, SUFFIX=0
               or multimedia/ffmpeg, SUFFIX=
        --> Only at multimedia/ffmpeg0, SUFFIX=0