#41 libc link warnings

[Mark Lentczner]

When built on FreeBSD w/gcc30, these link warnings come out at
the end. We should probably heed them and investigate to ensure
we are relying on bad things.

/usr/lib/libc.so: WARNING! setkey(3) not present in the system!
/usr/lib/libc.so: warning: this program uses gets(), which is unsafe.
/usr/lib/libc.so: warning: mktemp() possibly used unsafely;
consider using mkstemp()
/usr/lib/libc.so: WARNING! des_setkey(3) not present in the
system!
/usr/lib/libc.so: WARNING! encrypt(3) not present in the system!
/usr/lib/libc.so: warning: tmpnam() possibly used unsafely;
consider using mkstemp()
/usr/lib/libc.so: warning: this program uses f_prealloc(), which is
not recommended.
/usr/lib/libc.so: WARNING! des_cipher(3) not present in the
system!
/usr/lib/libc.so: warning: tempnam() possibly used unsafely;
consider using mkstemp()

Note: I'm only guessing that these are called from ptypes. It could
be in expat and/or something wheat calls directly.