Speeds up seeking mp3's on large files.

Thanks to Andrew Talbot for spotting this.

Some cards/drivers like ATI and the Geforce 8 driver return an error in
this case, make the test accept that. This lifts some constraints we
have to care for in WineD3D and removes one of the requirement for the
packing shader. We still need the packing shader for vs_1_1 -> ps_3_0
mapping and for indirect pixel shader varying addressing though.

This makes it easier to make this a per texture / per adapter property.
Somewhen we should rename the remaining lookup type in the general
lookup table to wraplookup.

OpenGL always offers filtering on all formats, and if the hardware
doesn't support it the driver falls back to software. Direct3D on the
other hand silently disables filtering, so that's what we should do too.

quartz: Try creating the file reader from the filter source first before falling back to the generic async file reader.

quartz: Make mpeg splitter keep track of play position and keep last sample if sending was not successful.

This fixes data discontinuities that earlier occured after a
stop/pause command or the downright rejection of a sample (S_FALSE).

This should fix the problem that in LoadLocation SFLAG_INTEXTURE path gl calls 
can be made without activating context, due to isInDraw checks.