bluez5_utils: add patch to fix readline issue

bluez5_utils: add patch to fix readline issue

Since bluez5_utils 5.48, some code using readline was compiled even if
readline was not available. After this issue was reported upstream, a
patch was proposed by an upstream developer to address the issue. This
commit integrates this patch (under review upstream), which fixes the
problem.

Fixes:

  http://autobuild.buildroot.net/results/3e266a79acab8b8eb33360f7afbc1cd6db46f7cb/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit d4158df6c19c76ea3405975b87f13b1c092a40e0)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>