deinterlace: Enable x86 assembly with nasm on MSVC
We need to remove x86inc.asm from the list of compiled assembly files because it is not supposed to be compiled separately. It is directly included by yadif.asm, and it exports no symbols.
The object file was getting ignored on all platforms except on msvc where it was causing a linker hang when building with debugging enabled because the object file had no debug symbols (or similar). We've seen this before in FFmpeg too, which uses nasm: gstreamer/meson-ports/ffmpeg!46 (merged)