fix gcc build

src/util/attrib.c

@@ -28,6 +28,7 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <assert.h>
 #include <string.h>
 #include <stdlib.h>
+#include <errno.h>
 
 int read_attribs(gamedata *data, attrib **alist, void *owner) {
     int result;

src/util/attrib.test.c

@@ -7,6 +7,7 @@
 #include <memstream.h>
 #include <CuTest.h>
 #include <tests.h>
+#include <string.h>
 
 static void test_attrib_new(CuTest * tc)
 {