Patch license update to developer's FAQ

I have added to the developer's FAQ that we don't want
non-BSD-compatible licensed patches:

<li>PostgreSQL is licensed under a BSD license. By posting a patch
to the public PostgreSQL mailling lists, you are giving the PostgreSQL
Global Development Group the non-revokable right to distribute your
patch under the BSD license. If you use code that is available under
a BSD-compatible license (eg. public domain), please note that in your
email submission. If the license is not BSD-compatible (e.g. GPL),
please do not post the patch.</li>

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://www.enterprisedb.com

+ If your life is a hard drive, Christ can be your backup. +