DRM modifiers are a BSD/Linux phenomenon. We can also remove a bunch of these checks too. No Linux specific symbol or header is **actually** used, and the DRM modifier is just represented as uint64_t. But kept the style of the file as is. Reviewed-by: Serdar Kocdemir <kocdemir@google.com> Reviewed-by: Yonggang Luo <luoyonggang@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27425>