Do not try to compile xz and xzdec tools.

libaria2 use xz to configure its source.
If we compile the xz tool, libaria2 will use the compiled binary.

However, on cross compilation, xz will be compiled for the target platform
and run on the host platform. And so, it will fails.

As we do not use those tools at all, lets not compile them.

kiwixbuild/dependencies.py

@@ -87,7 +87,7 @@ class lzma(Dependency):
     class Builder(MakeBuilder):
         @property
         def configure_option(self):
-            return "--disable-assembler"
+            return "--disable-assembler --disable-xz --disable-xzdec"
 
 class UUID(Dependency):
     name = 'uuid'