7026167: Broken fastdebug only build

Reviewed-by: cl
diff --git a/Makefile b/Makefile
index d93b319..0420700 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,8 @@
 
 all:: all_product_build 
 
+all_product_build::
+
 # Everything for a full product build
 ifeq ($(SKIP_PRODUCT_BUILD), false)