STYLE: Remove deprecated Python wrapping macros

These macros were deprecated for ITK 4.1, we are now preparing ITK 4.6, so this can be removed.

Change-Id: I86f04d7c082673cc72ac0676957830f2a0d64249
Merge topic 'RemoveDeprecatedMacros'

9be45b08 STYLE: Remove deprecated Python wrapping macros