Add sdk/assetstudio to the Windows build paths.

Change-Id: Ide8d418aa25cf39852a25e08fd2a27c7882586e7
diff --git a/core/main.mk b/core/main.mk
index 74424ee..518fd99 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -415,6 +415,7 @@
 	sdk/archquery \
 	sdk/androidprefs \
 	sdk/apkbuilder \
+	sdk/assetstudio \
 	sdk/common \
 	sdk/ddms \
 	sdk/hierarchyviewer2 \