This simplifies the loading code a bit. The constants were never
designed to be at the same location in all shaders, so there's no
point in using program.env. This way we don't collide with the d3d
shader constants and its easier to work together with NP2 fixups and
other shaders.

ole32/tests: Show that it's the loword of the separate flag parameter that determines the marshalling context.

wgl: Make sure WGL_SUPPORT_GDI_ARB is only seen on formats on which we set it during startup (in get_formats).

urlmon: Added BINDSTATUS_LOADINGMIMEHANDLER and BINDSTATUS_LOADINGMIMEHANDLER support to Binding object.

winetest: Rename xmalloc() & co to heap_xxx() to not imply they are based on malloc(), and add heap_free().

oleaut32: Add a failing VarFormat test showing that wine wrongly truncates decimals with large negative exponents instead of rounding.