Fix build error, test-case bug

This was SVN commit r7270.

source/maths/MD5.cpp

@@ -15,6 +15,8 @@
  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "precompiled.h"
+
 // Based on md5.cpp from Crypto++ 5.6.0:
 //   "md5.cpp - modified by Wei Dai from Colin Plumb's public domain md5.c"
 //   "any modifications are placed in the public domain"

source/maths/tests/test_MD5.h

@@ -26,7 +26,7 @@ public:
 	{
 		char digeststr[MD5::DIGESTSIZE*2+1];
 		for (size_t i = 0; i < MD5::DIGESTSIZE; ++i)
-			sprintf_s(digeststr+2*i, 4, "%02x", digest[i]);
+			sprintf_s(digeststr+2*i, 3, "%02x", digest[i]);
 		return digeststr;
 	}