build: Re-enable SLiRP (user networking)

build.sh

@@ -208,7 +208,6 @@ set -x # Print commands from now on
     --disable-sheepdog \
     --without-default-devices \
     --disable-blobs \
-    --disable-slirp \
     "$@"
 
 time make -j"${job_count}" 2>&1 | tee build.log

softmmu/vl.c

@@ -4372,8 +4372,10 @@ void qemu_init(int argc, char **argv, char **envp)
     if (default_net) {
         QemuOptsList *net = qemu_find_opts("net");
         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
+#ifndef XBOX
 #ifdef CONFIG_SLIRP
         qemu_opts_set(net, NULL, "type", "user", &error_abort);
+#endif
 #endif
     }