Rearrange several bits of the rrdtool build mechanism so that we're not
cheating quite as much. The end result is that rrdtool now compiles on
both ELF and a.out.
Closes pkg/14606 from Tim Preston <tim at flibble dot org>
program author and desired by at least one package user).
- format string patch for 64-bit systems
- add message notifying users that an executible cgi program has been
installed in their cgi-bin directory (since they may wish to disable
them).
