Don't compile against maven artifacts in buck build

Change-Id: Iabdc61a51b0c13debb97dd9a96fccc5a787d8c30
diff --git a/bucklets/yang.bucklet b/bucklets/yang.bucklet
index e73099c..eb8cd31 100644
--- a/bucklets/yang.bucklet
+++ b/bucklets/yang.bucklet
@@ -34,7 +34,7 @@
 
     yang_library(
       name = yang,
-      srcs = glob(['**/*.yang']),
+      srcs = glob(['**/*.yang'], excludes=['**/target/**']),
     )
 
     genrule(