Tell Soong about HOST_CROSS_*

This configures Soong to build windows binaries, which requires support
for 64-bit windows binaries in BUILD_PREBUILT for USE_SOONG=true.

module_arch_supported.mk did not support 64-bit being the secondary
architecture when evaluating multilib conditionals. All other uses of
HOST_*_IS_64_BIT already check the proper version.

Change-Id: Iff664733e6991f4adbe8ddd620b091bbb55d1d86
diff --git a/core/prebuilt.mk b/core/prebuilt.mk
index ed25f71..caa9909 100644
--- a/core/prebuilt.mk
+++ b/core/prebuilt.mk
@@ -72,6 +72,26 @@
 endif
 LOCAL_HOST_PREFIX :=
 endif
+
+ifdef HOST_CROSS_2ND_ARCH
+my_prefix := HOST_CROSS_
+LOCAL_2ND_ARCH_VAR_PREFIX := $($(my_prefix)2ND_ARCH_VAR_PREFIX)
+LOCAL_HOST_PREFIX := $(my_prefix)
+include $(BUILD_SYSTEM)/module_arch_supported.mk
+ifeq ($(my_module_arch_supported),true)
+$(warning $(LOCAL_MODULE) $(LOCAL_2ND_ARCH_VAR_PREFIX))
+OVERRIDE_BUILT_MODULE_PATH :=
+LOCAL_BUILT_MODULE :=
+LOCAL_INSTALLED_MODULE :=
+LOCAL_MODULE_STEM :=
+LOCAL_BUILT_MODULE_STEM :=
+LOCAL_INSTALLED_MODULE_STEM :=
+LOCAL_INTERMEDIATE_TARGETS :=
+include $(BUILD_SYSTEM)/prebuilt_internal.mk
+endif
+LOCAL_HOST_PREFIX :=
+LOCAL_2ND_ARCH_VAR_PREFIX :=
+endif
 endif
 endif