meson: Add coroutines component to llvmpipe build.

Fixes: d32690b4 ("gallivm: add coroutine pass manager support")
Suggested-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
22 jobs for !1878 with fix-meson-coroutine in 14 minutes and 10 seconds (queued for 2 seconds)
merge request