Make the override-feature-defines script compatible with Python v3
https://bugs.webkit.org/show_bug.cgi?id=105742

Reviewed by Martin Robinson.

Instead of printing output through a statement, use the print function and format
the output using the str.format method. This makes the script runnable with Python v3.

* gtk/override-feature-defines:
(adjust_feature_defines_makefile):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139065 268f45cc-cd09-0410-ab3c-d52691b4dbfc