man: use hard coded dates in manual pages

Using the installation date might be misleading and harms
reproducible builds. Omitting the dates completely might
be dangerous because it seems to be a required field:

 The only firm requirement of the mdoc prologue is that
 the Dd macro comes first: many formatting systems will
 read up to the first macro to determine the formatting
 language. If Dd is not encountered first, the mdoc format
 may not be recognised.

http://manpages.bsd.lv/mdoc.html

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