Don't just look for python2. Instead, first look for python, and then

see whether it's Python 2 or not; if it's not, *then* look for Python 2.

That way, you can use Python on systems where python is Python 2 and
python2 doesn't exist.

Move the check for Python up after the check for Perl.  (All the program
checks arguably belong together.)

AC_PATH_PROG() does AC_SUBST() for you; don't do it ourselves.

svn path=/trunk/; revision=49253

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