[QGIS-Developer] Windows build failure

[David Adler]

On 64-bit Windows 10, attempting to build QGIS results in many errors 
that seem tied to a problem building the project qgis_core which results 
in the error:
Py_Initialize: unable to load the file system codec

Running configonly.cmd seemed to complete without errors. I had to 
change package-nightly.cmd to set
WITH_ORACLE=FALSE.

There must be a simple answer to why this is failing.