Build fix - include sdk/lint in build

Change-Id: Id65b7a3f72dd6c5104738fa872f3beb029d91163
diff --git a/core/main.mk b/core/main.mk
index 5f01238..569d4dc 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -444,6 +444,7 @@
 	sdk/layoutopt \
 	sdk/ninepatch \
 	sdk/rule_api \
+	sdk/lint \
 	sdk/sdkstats \
 	sdk/sdkmanager \
 	sdk/swtmenubar \