mame window captures the mouse pointer

[shankao]

This looks like a regression from 0.160

Steps to reproduce:
1. Start mame in windowed mode. Example: "mame -w ibm5150"
2. Notice that the mouse pointer has disappeared and the window can't be closed with the close button.

Expected:
The pointer is still available, as it was happening with the previous ubuntu packaged version.

The problem behaves in a similar way to this old sdlmame bug report: http://mametesters.org/view.php?id=3131

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: mame 0.175-1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jul 19 22:40:51 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-11-25 (1332 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120627)
ProcEnviron:
 LANGUAGE=en_SG:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_SG.UTF-8
 SHELL=/bin/bash
SourcePackage: mame
UpgradeStatus: Upgraded to yakkety on 2015-03-14 (492 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.