shell32: Reset pszHome if it's not usable so we don't try to reuse it when setting up the Desktop symlink.

The corresponding folder is called 'My Documents' but on Linux it's
usually called 'Documents' so that's much more appropriate fallback
than 'Personal'.

wined3d: Specify the initial texture contents with wined3d_texture_create() in wined3d_device_create_cursor_texture().

Use PKEY_AudioEndpoint_PhysicalSpeakers to set the speaker config in dsound.

Fixes resampling errors caused by truncating floating point numbers.