Prefer Python 3 tools
The last three commits already made configure recommend installing Python 3 packages and look for versioned executables, however with a low priority. This is a problem on systems such as OpenBSD 6.5 with a default Python version at 2.7, where 3.7 flavored Python packages get installed with a "-3" binary suffix. That is, when both rst2man and rst2man-3 are installed at configure time, the lower version will be picked unless explicitly passed through `--with-feature' arguments. Regardless of this specific case, trying more specificly versioned tool names first seems correctly in line with recent development and less error prone, so change it accordingly.
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