[PATCH] Improve pam header detection

[Moriyoshi Koizumi]

Hello,

The second patch is to handle the case where PAM headers
are installed in $INCLUDES/pam/ rather than $INCLUDES/security/ .

Perhaps I was missing something, but I didn't manage to get it
built without this patch on MacOS X, with --enable-pam specified.

Hope this helps anyway, too.

Regards,
Moriyoshi

p.s. the patches can be downloaded from http://www.voltex.jp/patches/