Bug#197771: xfree86-common should configure mouse button emulation on PPC

["mike@flyn.org" <mike@flyn.org>]

Package: xfree86-common
Version: 4.2.1-8

Laptops made by Apple have only one mouse button.  In order to get around this 
limitation, the Linux kernel can simulate mouse clicks using certain keyboard 
keys.  However, this must be configured using the kernel's sysctl interface.

Xfree86-common should generate entries in /etc/sysctl.conf for mouse button 
emulation.  The following is an example /etc/sysctl.conf fragment:

# Activate Mouse Buttons; see <linux/input.h>
dev.mac_hid.mouse_button_emulation=1
dev.mac_hid.mouse_button3_keycode=96    # KEY_KPENTER
dev.mac_hid.mouse_button2_keycode=87    # KEY_F11

This example maps the keypad enter key to a mouse's right-click and the F11 key 

to a mouse's middle-click.  Ideally, a script would prompt the user to set these 

values, depending on his preferences.

This would allow mouse button emulation to work out of the box when using Debian.