mtd-utils: ensure libmtd.a always gets built

Closes #2785

If only ubi* is selected, libmtd.a wouldn't get built breaking the build.

Based on patch by Patrick Ziegler <patrick.ziegler@fh-kl.de>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/CHANGES b/CHANGES
index e07c798..c73fdbf 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2,11 +2,13 @@
 
 	Fixes all over the tree.
 
-	Updated/fixed packages: libglib2, module-init-tools, qt
+	Updated/fixed packages: libglib2, module-init-tools,
+	mtd-utils, qt
 
 	Issues resolved (http://bugs.uclibc.org):
 
 	#2479: host-module-init-tools 3.11 fails to build
+	#2785: mtd-utils build fails due to missing libmtd
 	#2809: failed to compile libglib2
 	#2821: [PATCH] Patch for JavaScriptCore in QtWebKit module
 	#2827: qt-4.7.0-pthread_getattr_np.patch invalid for qt 4.6...