Change shift expressions to unsigned types. Shifting signed values to

a result that is not representable has undefined behaviour.

code/qcommon/md4.c

@@ -106,8 +106,11 @@ static void copy64(uint32_t *M, byte *in)
 	int i;
 
 	for (i=0;i<16;i++)
-		M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
-			(in[i*4+1]<<8) | (in[i*4+0]<<0);
+		M[i] =
+			((uint32_t)in[i*4+3] << 24) |
+			((uint32_t)in[i*4+2] << 16) |
+			((uint32_t)in[i*4+1] <<	 8) |
+			((uint32_t)in[i*4+0] <<	 0) ;
 }
 
 static void copy4(byte *out,uint32_t x)