[lmi] Built today's wx-2.9.2 snapshot

[Greg Chicares]

Soon I'll update 'install_wx.make' to install the 2011-07-04 wx snapshot.
(There's a 2011-06-29 release candidate here:
  ftp://ftp.wxwidgets.org/pub/2.9.2-rc1/
but it provides only a GUI installer. I hope the actual release provides
.tar.bz2 or at least .tar.gz files. Meanwhile, I figure snapshots will
probably match the release candidate except for critical fixes.)

Very few warnings are seen with MinGW gcc-3.4.5, and I believe we've seen
most or all of them before:

../src/msw/renderer.cpp:122: warning: unused parameter 'dc'
../src/common/docview.cpp:1485: warning: 'docNew' might be used uninitialized 
in this function
../src/msw/mediactrl_am.cpp:2023: warning: passing `double' for converting 1 of 
`wxLongLongNative::wxLongLongNative(long long int)'
../src/propgrid/property.cpp:2108: warning: passing `double' for converting 1 
of `wxImage& wxImage::Rescale(int, int, wxImageResizeQuality)'
../src/propgrid/property.cpp:2108: warning: passing `double' for converting 2 
of `wxImage& wxImage::Rescale(int, int, wxImageResizeQuality)'

Next I'll build lmi...