Add linux pacman add_extsources for wayland (#852)

packages/w/wayland/xmake.lua

@@ -12,7 +12,7 @@ package("wayland")
     add_resources("1.19.0", "protocols", "https://wayland.freedesktop.org/releases/wayland-protocols-1.21.tar.xz", "b99945842d8be18817c26ee77dafa157883af89268e15f4a5a1a1ff3ffa4cde5")
 
     if is_plat("linux") then
-        add_extsources("apt::libwayland-dev")
+        add_extsources("apt::libwayland-dev", "pacman::wayland")
     end
 
     add_deps("meson", "libxml2", "libffi", "expat", "bison")