Change dx_time data type in vpxdec.c
Change dx_time data type in vpxdec.c

Change dx_time data type to int64_t to prevent
test time overflow when decoding long video.

Change-Id: I3dd5e324a246843e07e635fd25c50e71e385ed70
Signed-off-by: James Yu <89b6f14d7fa7989e3673d58c5f3efce407e3fc27@linaro.org>

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rudeau/aom,kleopatra999/webm.libvpx,shareefalis/libvpx,ittiamvpx/libvpx,pcwalton/libvpx,mwgoldsmith/vpx,abwiz0086/webm.libvpx,liqianggao/libvpx,ShiftMediaProject/libvpx,thdav/aom,abwiz0086/webm.libvpx,charup/https---github.com-webmproject-libvpx-,liqianggao/libvpx,shyamalschandra/libvpx,Distrotech/libvpx,jdm/libvpx,VTCSecureLLC/libvpx,openpeer/libvpx_new,matanbs/webm.libvpx,pcwalton/libvpx,pcwalton/libvpx,felipebetancur/libvpx