1.2.4dev: Use PYTHON variable in Makefile
1.2.4dev: Use PYTHON variable in Makefile

This revises r16797. Patch by Jun Omae.

[skip ci]

Refs #13055.


git-svn-id: 68cfa85dc440743b03ced815f1f2f5f2381a3d7a@16800 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac