mf: Static dependencies between Metafont files

mf: Static dependencies between Metafont files

A glimpse at the history shows that the last change of 'include'
statements has been in 2013, and I'm not even sure here. IMO this
warrants removing the fragile solution to dynamically generate the
dependency files.

[hanwenn, 2020-03-17 07:13:36]

I object to this change.

[hanwenn, 2020-03-17 07:16:37]

the solution to a fragile mechanism for determining dependencies is to build a
robust mechanism for determinign dependencies.

[hahnjo, 2020-03-17 20:49:23]

Abandoned in favor of https://codereview.appspot.com/553700043