Don't build OTA package for aosp_emulator_us

This allows "make dist" to work on that configuration.

A better fix would be to allow each product to specify
whether it's an emulator target or a device target, and
to adapt to that, but that'd be a lot more intrusive.

Change-Id: I47708025204a4991466abceb1708a3020a543238
diff --git a/core/Makefile b/core/Makefile
index 2f316ca..46f5311 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -907,6 +907,7 @@
 ifneq ($(TARGET_SIMULATOR),true)
 ifneq ($(TARGET_PRODUCT),sdk)
 ifneq ($(TARGET_PRODUCT),generic)
+ifneq ($(TARGET_PRODUCT),aosp_emulator_us)
 
 name := $(TARGET_PRODUCT)
 ifeq ($(TARGET_BUILD_TYPE),debug)
@@ -936,6 +937,7 @@
 .PHONY: otapackage
 otapackage: $(INTERNAL_OTA_PACKAGE_TARGET)
 
+endif    # TARGET_PRODUCT != aosp_emulator_us
 endif    # TARGET_PRODUCT != generic
 endif    # TARGET_PRODUCT != sdk
 endif    # TARGET_SIMULATOR != true