Python detection fallout with non GNU sed

[Andreas Tobler <andreast-list@fgznet.ch>]

Hi all,

a recent commit to the configure.ac/configure in src/gdb broke the 
machinery on machines which do not have GNU sed.

The issue is the following:

sed -e 's,^.* -l\(python[0-9]*[.]\?[0-9]*\).*$,\1,'`

On certain sed implementations the quantifier '\?' can not be used on 
backreferences.

This breaks the detection of python.

Here it fails on darwin and FreeBSD.

I tried the follwoing on those systems and on linux-ppc:

sed -e 's,^.* -l\(python[0-9]*[.][0-9]*\).*$,\1,'`

(the same expression w/o the \? quantifier.)

So far I do not see a drawback. But maybe I did not cover all aspects.
I do not have a *win* system to test on.

What do you think?

Gruss,
Andreas