Check for common broken nVidia+Mesa OpenGL library setups.
Add some quoting.

Call GetProcAddress only when a function is actually called, not at
declaration time.

Fixed DdeCreateDataHandle for non NULL or CF_TEXT formats.
Various fixes (cosmetics, better error checking).

- Support both ANSI & Unicode ListView notifications.
- Fixed a few bugs.

stream.

in the registry, even though we don't yet execute it.

  modify the input string if it didn't change.
- Correct array size.
- Logically separate the centring from the ellipsification.
- Comment on prefix error.

  module.
- Use constants instead of variables.

specify argument types in order to fix a "bug" concerning
integer/string scalars.

SPI_SETSCREENREADER.
Save to registry value of SPI_SETSCREENSAVEACTIVE action.
Changed processing of action SPI_SETFASTTASKSWITCH to conform to
Windows behaviour on and after WinNT 4.0, Windows 95.

user32.TrackMouseEvent and call this function in accordance with the
specs.

- Rearrange code into three distinct areas; DrawText, GrayString,
  TabbedText.
- Remove unused macros.
- Modify treatment of Tab arguments to fit with observed behaviour.
  e.g. DrawTextEx with DT_TABSTOP but null dtp will not take the
  setting from the flags.  Also only uses bits 15 to 8, not the
  higher bits.