skip xkbcommon dep when cross-compiling

xkbcommon is built with meson, which does not support cross compilation yet
(conan-io/conan#4529)

(cherry picked from commit 1fb4aea)

conanfile.py

@@ -260,7 +260,7 @@ def requirements(self):
         if self.options.with_libalsa:
             self.requires("libalsa/1.1.9")
         if self.options.GUI:
-            if self.settings.os == "Linux":
+            if self.settings.os == "Linux" and not tools.cross_building(self.settings):
                 self.requires("xkbcommon/0.8.4@bincrafters/stable")
 
     def system_requirements(self):