ID 527246 - kUnsetVersion definition missing DDImage_API macro

Problem summary
kUnsetVersion definition missing DDImage_API macro.

When building plugins against Nuke, the following error may occur:

ERROR failed to load 'LD_3DE_Classic_LD_Model.so' plugin - /tmp/build/nuke-plugins/Linux_7/14.0v1-64/plugin/LD_3DE_Classic_LD_Model.so: undefined symbol: _ZN2DD5Image2Op13kUnsetVersionE

Customer reported version
Nuke 14.0v1

Customer reported platform
CentOS 7

Steps to reproduce

1) Build a plugin against Nuke.

2) Notice that the following error occurs when loading the plugin: 

ERROR failed to load 'LD_3DE_Classic_LD_Model.so' plugin - /tmp/build/nuke-plugins/Linux_7/14.0v1-64/plugin/LD_3DE_Classic_LD_Model.so: undefined symbol: _ZN2DD5Image2Op13kUnsetVersionE

Expected behaviour
Compiled plugins should load without any errors.

Actual behaviour
The following error occurs:

ERROR failed to load 'LD_3DE_Classic_LD_Model.so' plugin - /tmp/build/nuke-plugins/Linux_7/14.0v1-64/plugin/LD_3DE_Classic_LD_Model.so: undefined symbol: _ZN2DD5Image2Op13kUnsetVersionE

Workaround
You may be able to work around this issue by defining your own kUnsetVersion.

Reproduced by support
This issue has been identified by our engineering team.