Patch 5107 from Steve Bavin, enable locking on sdl sim, now mutexes actually MUT EX on the SDL sim


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9638 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index 4c25a97..2f1d451 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -197,3 +197,4 @@
 Tom Ross
 Anton Romanov
 Jean-Luc Ohl
+Steve Bavin