quartz: Data may be incomplete at the end of file so do not assert if we have less data than expected.

Samba 3.0.28a (as shipped with Ubuntu 8.04) seems to break when using
cached credentials backed by winbindd, returning a BH error in our test
if we still need to provide a password. Handle this and report a more
correct error.

wined3d: Report the driver description as reported by the Windows drivers when a device string is entered in our device table.

The distinction between PLAYING and STOPPED has always been whether
lpPlayPtr is NULL, so just use that instead of two states.

The WAVE_DIRECTSOUND bit of dwFlags isn't examined, so no point in correcting
it.

This moves the GLSL and ARB specific reserved constants out of directx.c into
the get_caps methods of the shader backends. That way the number of reserved
constants remains in the backend.

GL_LIMITS({v/p}shader_constantsF) now contains the real number of constants as
advertised by GL instead of some mixture of GL info and backend implementation
specifics. This makes it easier for backends to decide how many constants to
use.