and if so, define _XOPEN_SOURCE to 500 in an attempt to build with less
warnings (on the 64bit versions)

remains undocumented as this is not the way we recommend)

some general cleanups

already UTF-8 encoded. We check for this case and copy the raw string manually
to avoid the problem. This code can be made conditional in the future when
OpenSSL has been fixed. Work-around brought by Alexis S. L. Carvalho.

the command line

possibly only on some platforms, but it happens on my Solaris 2.7 box and I
don't know anyone else that regularly build curl with krb4 support.

picky warnings

functions (and prevent warnings)

report #1004105

by Gisle Vanem's patch, only modified by me.

the digest code. This fixes it.