Fix determination of Perl interpreter: A perl or perl5

 OpenSSL CHANGES

 _______________

 Changes between 0.9.3a and 0.9.4

  *) Fix determination of Perl interpreter: A perl or perl5

     _directory_ in $PATH was also accepted as the interpreter.

     [Ralf S. Engelschall]

  *) Fix demos/sign/sign.c: well there wasn't anything strictly speaking

     wrong with it but it was very old and did things like calling

     PEM_ASN1_read() directly and used MD5 for the hash not to mention some

	my $path;

	foreach $path (split /:/, $ENV{PATH})

		{

		if (-x "$path/$name")

		if (-f "$path/$name" and -x _)

			{

			return "$path/$name" unless ($name eq "perl" and

			 system("$path/$name -e " . '\'exit($]<5.0);\''));