Warning cleanups for ecpg tests. Avoid doing pointer arithmetic on void *,

remove old-style function declarations, and mark a function "static".
There are some remaining warnings, but this fixes most of them, anyway.

src/interfaces/ecpg/test/testdynalloc.pgc

@@ -2,7 +2,7 @@
 exec sql include sqlca;
 #include <stdlib.h>
 
-int main()
+int main(void)
 {  
    exec sql begin declare section;
    char **cpp=0;