Remove bad error message about missing icon on Windows.

A recent regression made the Windows emulator print an error message
on startup, claiming the program icon could not be found. This
message is misleading because the icon is not needed at runtime
at all. Instead, on this platform, it is embedded as a resource
within the executable itself (and available as an .ico file under
images/android_emulator.ico).

This patch does the following:

- Remove the erroneous message from Windows builds.

- Remove the hard-coded 32x32 icon bitmap from the executable,
  since it is of no used on Windows (embedded resource), Linux
  (uses 128x128) or Darwin (uses 256x256).

Change-Id: I0e7c3c5540768726ec08aff6f3999756efed0be7
(cherry picked from commit a68e95b8a92147f8ebd10efb74721fed7fe349ae)
Merge "Remove bad error message about missing icon on Windows." into studio-1.0-release