This patch makes the binding check messages a little more understandable
and coherent. The original messages looked like (for a perl binding only
build):

  checking Checking for Python... no
  checking Checking for perl... yes
  checking for perl... /usr/bin/perl

Note the duplicated 'checking Checking' and '[cC]hecking for perl'
statements. With the patch applied, the output looks like thus:

  checking whether python bindings are enabled... no
  checking whether perl bindings are enabled... yes
  checking for perl... /usr/bin/perl

Signed-off-by: Steve Beattie <steve@nxnw.org>
Acked-by: Tyler Hicks <tyhicks@canonical.com>