Execute the division-by-W for perspective-correct interpolation of
values in the clipper, moving them out of the rasterization inner loop.

- Linear simply indicates that the mapped physical address is always MappedVAddr+0x0C000000, thus this memory can be used for hardware devices' DMA (such as the GPU).

The affected code is no longer limited by compiler support on that platform.

Double-clicking a texture parameter command in the pica command lists will spawn these as a new tab in the pica command list dock area.

Fixes building with clang.