loader: print a better message about reserving memory

[Dan Kegel]

Vitaliy wrote:
>Austin English wrote:
>> With ubuntu updating to the 2.6.24 kernel, a lot more people are
>> running into errors about reserving memory. This patch adds a
>> suggestion to check  /etc/sysctl.conf.
>>
>> You may need to edit /etc/sysctl.conf to give Wine access to this memory.\n",
>
>Can you be more specific what did Ubuntu do to break Wine?

It would have been helpful if Austin had linked to the bug report
from his patch.  I went and filed a (very well documented :-) bug report
http://bugs.winehq.org/show_bug.cgi?id=12548
that turned out to be a dup of the one Austin had been discussing
the bug in.

Austin's patch is helpful, but I think we can do better.  For instance,
we could ship a helper app that pops up a gui
and asks whether the user wants us to work around the problem
(by doing  gksudo sysctl -w vm.mmap_min_addr=0, say)
and run it in the preloader if we can't map the lowest page.