package/mono: fixing mono version

This patch fixes to the correct mono version 4.0.0 as stated on
the download page.

Fixes:
http://autobuild.buildroot.net/results/227/227f942107e4fcbc14bb1e7d97e1e2758d6f3f2d/

[Peter: add autobuilder reference]
Signed-off-by: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mono/mono.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MONO_VERSION = 4.0.1
+MONO_VERSION = 4.0.0
 MONO_SITE = http://download.mono-project.com/sources/mono
 MONO_SOURCE = mono-$(MONO_VERSION).tar.bz2
 MONO_LICENSE = GPLv2 or MIT (compiler, tools), LGPLv2 (runtime libs), MIT (class libs) or commercial