prg_exec_fail3 fails on release variant

[troy d. straszheim]

prg_exec_fail3 depends on assert() for failure... doesn't work when -DNDEBUG is on:

int cpp_main( int, char *[] ) note the name {

int div = 0;

assert( div != 0 );

#if NDEBUG

printf("assert check turned off under NDEBUG\n"); return 1;

#endif

return 0;

}