Changes needed for IMP-1116.

The IMP-1116 patch changes some of the codec interfaces to int64_t (from int).
This change in Impala-lzo is needed for the code to compile.

Change-Id: I44f3c1202a4f01541688a92b2c00533f68d5a9c8
(cherry picked from commit 10482edf268b9e57a420523c610a3ce22b48ddc2)