[libxkbcommon] Support double backend installation (#914)

* [libxkbcommon] Support double backend installation

* [libxkbcommon] disable backend when config is false

* [libxkbcommon] use format instead of concatenation

packages/l/libxkbcommon/xmake.lua

@@ -12,12 +12,15 @@ package("libxkbcommon")
         add_extsources("apt::libxkbcommon-dev")
     end
 
-    add_configs("x11", {description = "Switch backend to X11 (default is wayland).", default = false, type = "boolean"})
+    add_configs("x11", {description = "Enable backend to X11 (default is false).", default = false, type = "boolean"})
+    add_configs("wayland", {description = "Enable backend to X11 (default is true).", default = true, type = "boolean"})
     on_load("linux", function (package)
         if package:config("x11") then
             package:add("deps", "libxcb", "xcb-proto", "libxml2")
             package:add("extsources", "pacman::libxkbcommon-x11")
-        else
+        end
+
+        if package:config("wayland") then
             package:add("deps", "wayland")
             package:add("extsources", "pacman::libxkbcommon")
         end
@@ -26,13 +29,16 @@ package("libxkbcommon")
     add_deps("meson")
     on_install("linux", function (package)
         package:addenv("PATH", "bin")
-        local configs = {"-Denable-docs=false", "-Dc_link_args=-lm"}
-        table.insert(configs, "--libdir=lib")
-        if package:config("x11") then
-            table.join2(configs, {"-Denable-wayland=false", "-Dxkb-config-root=/usr/share/X11/xkb", "-Dx-locale-root=/usr/share/X11/locale"})
-        else
-            table.join2(configs, {"-Denable-x11=false", "-Dxkb-config-root=/usr/share/X11/xkb", "-Dx-locale-root=/usr/share/X11/locale"})
-        end
+        local configs = {
+          "-Denable-docs=false", 
+          "-Dc_link_args=-lm", 
+          "-Dxkb-config-root=/usr/share/X11/xkb", 
+          "-Dx-locale-root=/usr/share/X11/locale", 
+          "--libdir=lib",
+          format("-Denable-x11=%s", package:config("x11")),
+          format("-Denable-wayland=%s", package:config("wayland")),
+        }
+
         import("package.tools.meson").install(package, configs)
     end)