When using crunch compression textures fail to load in builds and are replaced with black.

Steps to repro:
1. Load texture into unity
2. Apply texture to an object in scene
3. Tick use crunched compression
4. Build, notice texture is black

Alternatively download the attached project 'case_889527_CrunchedTextureFail.zip' in comment below.

Reproduced on 5.5.2p2 5.6.0b11 5.6.0f1 2017.1.0a3

Not reproduced on : 5.6.0b4

Regression introduced in: 5.6.0b6

Expected result: Crunch textures to work in standalone builds
Actual result: Crunch textures are being loaded as black

Screenshots attached.