[Bug-wget] python3

[Jérémie Courrèges-Anglas]

wget-1.16.1 introduced a change wrt. python.  Just upgrading the port
lead to the following failure:

checking whether /usr/local/bin/python3.4 version is >= 3.0... no
configure: error: Python interpreter is too old
*** Error 1 in . (/usr/ports/infrastructure/mk/bsd.port.mk:2725 
'/usr/ports/pobj/wget-1.16.1/.configure_done': @for d in /usr/ports/pobj/wge...)
*** Error 1 in /usr/ports/net/wget 
(/usr/ports/infrastructure/mk/bsd.port.mk:2473 'all')

This is because when python 3 support is requested in our ports
framework, the following values are set in the ./configure script
environment:

  PYTHON="/usr/local/bin/python3.4"
  ac_cv_prog_PYTHON="/usr/local/bin/python3.4"
  ac_cv_path_PYTHON="/usr/local/bin/python3.4"

I "fixed" this by:
1. forcing PYTHON to the empty string, to avoid the error message
2. setting am_cv_pathless_PYTHON so that tests can still pass (after
   installation of python3 of course)

  
http://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/net/wget/Makefile.diff?r1=1.65&r2=1.66

I thought I'd let you know about this, even though I'm not sure if there
is a reasonable way to "solve" this issue. I feel that AM_PATH_PYTHON is
doing the right thing.

BTW, python3.4 could be added to _AM_PYTHON_INTERPRETER_LIST.

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