align.cgi: cstdlib already included no need for stdlib.h

C++ code should prefer cstdlib over stdlib.h

algo/cgi/align.cpp

@@ -3,7 +3,6 @@
 #include <stdio.h>
 #include <string.h>
 #include <cstdlib>
-#include <stdlib.h>
 #include "../core/dynprog.h"
 #include "../core/fasta.h"
 #include "../core/lazy_msa.h"