community/texmf-dist: allow installing duplicate man pages

This tries to be a maintainable solution for the issue that both the source repo for the texlive package and the sources for texmf-dist contain man pages for the applications provided by the texlive package.

It adds a postfix to the man pages of texmf-dist, so that they can be installed at the same time. This wastes storage space for the duplicates. Especially since the man pages provided by texlive-doc should be considered the single source of truth for the man pages, it is suboptimal to have the duplicates. However, is absence of any obvious clean way to remove the duplicates, this may be a sensible alternative.