COLLADAMaya plugin won't load Maya 2018.2

I downloaded the v1.6.62 binary for Mac 64 bit COLLADA-MAYA-MAC-2017 and installed the plugin as directed into Maya 2018.2.

When I go to Windows -> Preferences/Settings -> Plug-In Manager and attempt to load the plugin, I get this error:

```
// Error: file: /Applications/Autodesk/maya2018/Maya.app/Contents/scripts/others/pluginWin.mel line 290: Unable to dynamically load : /Users/Shared/Autodesk/maya/2018/plug-ins/COLLADAMaya.bundle
dlopen(/Users/Shared/Autodesk/maya/2018/plug-ins/COLLADAMaya.bundle, 1): Symbol not found: __ZN10MDGContext8fsNormalE
Referenced from: /Users/Shared/Autodesk/maya/2018/plug-ins/COLLADAMaya.bundle
Expected in: /Applications/Autodesk/maya2018/Maya.app/Contents/MacOS/libOpenMaya.dylib
in /Users/Shared/Autodesk/maya/2018/plug-ins/COLLADAMaya.bundle //
// Error: file: /Applications/Autodesk/maya2018/Maya.app/Contents/scripts/others/pluginWin.mel line 290: dlopen(/Users/Shared/Autodesk/maya/2018/plug-ins/COLLADAMaya.bundle, 1): Symbol not found: __ZN10MDGContext8fsNormalE
```

Start by reproducing the load failure in Maya 2018.2 using the COLLADAMaya.bundle installed at /Users/Shared/Autodesk/maya/2018/plug-ins. Investigate the missing MDGContext::fsNormal symbol reported by dlopen and verify that the plugin loads without the symbol error in the target Maya version.

Written by the indexing model from the issue text.