Oops. This should come closer to building on Windows..

Oops.  This should come closer to building on Windows..

* plugins.c: Only include dlfcn.h if USE_DLOPEN.
(struct plugin_file_handle): Only include a pointer if USE_DLOPEN.
(krb5int_open_plugin, krb5int_get_plugin_data, krb5int_close_plugin,
krb5int_open_plugin_dir, krb5int_close_plugin_dir): Only use the
dlopen interface if USE_DLOPEN is defined.
(krb5int_get_plugin_dir_data, krb5int_get_plugin_dir_func): Use
krb5int_get_plugin_data/func instead of dlsym.  Drop some debugging
code.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@17713 dc483132-0cff-0310-8789-dd5450dbe970