Merge branch 'fix-example' into 'master'

add errno.h to fix example

See merge request !1016

mace/examples/cli/example.cc

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #include <dirent.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <malloc.h>
 #include <sys/mman.h>