Maintenance. Just to make it compilable.

[yosukeora]

Hi, it looks OpenDCP's main repository has stacked on the way half to add OpenEXR support. And also OpenEXR support looks almost completed but stacked? at the fork of SieuDoTia.

I thought the main repository should be kept compilabe for anyone, so here I made a little bit of instant modifications. Checked compilation success on Mac and Linux (CLI only). Haven't tested the actual execution results.