Fix windows make: layoutlib_api moved to sdk.git too.

Change-Id: Ia030eda4514361b20a5ecb29c997ab625909228c
diff --git a/core/main.mk b/core/main.mk
index 4e79ca1..386c0c9 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -391,6 +391,7 @@
 	sdk/androidprefs \
 	sdk/apkbuilder \
 	sdk/jarutils \
+	sdk/layoutlib_api \
 	sdk/layoutlib_utils \
 	sdk/ninepatch \
 	sdk/sdkstats \