Update: Redesign Featureless Make's -d/--define to append instead of overwrite.

Update: Redesign Featureless Make's -d/--define to append instead of overwrite.

The built in defines can be large and complex.
The defines passed through the program arguments should be for exceptional or situational purposes.
By using append instead of overwrite, the -d/--define better operates as an exceptional or situational process.