8.0 ecpg crashes with "create table as" statement.

ecpg on 8.0.x crashes while compiling "create table as" statements. For
example,

#include <sqlca.h>
int main(){
EXEC SQL create table a as select 1;
exit(0);
}

Here's a patch attached.

--
TANIDA Yutaka <tanida(at)sra(dot)co(dot)jp>