libmix: fix some compatibility in decode to support 64-bit user space

BZ: 178142

fix some compatibility(H264/MPEG4/H263) in decode to
support 64-bit user space

Change-Id: I2fad23bd25baeb366394214ede9209ac36781c8f
Signed-off-by: Gu, Wangyi <wangyi.gu@intel.com>
11 files changed