avoid GNU Make grouped targets and templates to build womanpages

* grosciteco.tes generates two output files.
  First this was modeled with `%.woman %.woman.tec : ...`, but it creates independant rules
  which could result in superfluous builds and broke parallel builds.
  Then I tried grouped targets (`%.woman %.woman.tec &: ...`) which were supposed to solve the
  problem cleanly. However they turned out to be buggy with pattern rules,
  so I used templates instead.
  Unfortunately grouped targets turned out to be unreliable in general and that broke
  some older platforms, resulting in broken .woman.tec files.
* The same can be achieved by declaring .woman files the main artifact and
  having an empty rule like `%.woman.tec : %.woman;`.
  If anything draws in .woman.tec, it will still execute the rule only once.

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