FIX: [imx] drop decoder frames which are returned with flag VPU_DEC_OUTPUT_MOSAIC_DIS set
FIX: [imx] removed unnecessary block that releases an associated pts
Revert "configure.in: enable FFMPEG static build for ARM, some cleanups. Tested on i686, x86_64, arm (RPi & Cubox-i)."

This reverts commit 26c44f59885cbf6a18fa02546e730fad567f2550.
fixups