handling to x509.c

`openssl' and second, the shortcut symlinks for the `openssl <command>' are no
longer created. This way we have a single and consistent command line
interface `openssl <command>', similar to `cvs <command>'.

Notice, the openssl.cnf, openssl.c and progs.pl files were changed after a
repository copy, i.e. they still contain the complete file history.