[PATCH] os/xsha1.c: Add license and copyright attribution.

[Carl Worth]

I'm interested in copying this code to the mesa project, but before
doing that it seems prudent to have the license and copyright
attributions in place before copying that. To get this list of names I
went through:

	git log -- os/xsha1.c
and:
	git log -- render/glyph.c
---
 os/xsha1.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/os/xsha1.c b/os/xsha1.c
index 24c0aa2..d7e4b3a 100644
--- a/os/xsha1.c
+++ b/os/xsha1.c
@@ -1,3 +1,26 @@
+/* Copyright © 2007 Carl Worth
+ * Copyright © 2009 Jeremy Huddleston, Julien Cristau, and Matthieu Herrb
+ * Copyright © 2009-2010 Mikhail Gusarov
+ * Copyright © 2012 Yaakov Selkowitz and Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of SuSE not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  SuSE makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ *
+ * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
+ * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
 #ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
 #endif
-- 
2.1.1