tests: test-canon: include sys/stat.h for mkdir()

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

test/stdlib/test-canon.c

@@ -28,6 +28,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <sys/param.h>
+#include <sys/stat.h>
 
 /* Prototype for our test function.  */
 extern int do_test (int argc, char *argv[]);