* include/vlc_common.h: include stdlib.h
* include/ninput.h, src/input/stream.c, src/input/input.c:
    new stream_Block() function to read a block_t from the input.
    es_out_Send() takes a block_t as input, for PES (deprecated) use es_out_SendPES().
* modules/demux/*: changed to new es_out_Send(). asf.c and avi.c still use es_out_SendPES() though.