Merge changes from topic "shipping-on-vendor"

* changes:
  build: fix builds when first_api_level isn't defined as property
  Move ro.product.first_api_level to vendor/build.prop
diff --git a/core/Makefile b/core/Makefile
index a299d82..e2647ea 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -352,7 +352,11 @@
 
 $(INSTALLED_BUILD_PROP_TARGET): $(intermediate_system_build_prop) $(INSTALLED_RECOVERYIMAGE_TARGET)
 	@echo "Target build info: $@"
+ifdef BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE
+	$(hide) grep -v 'ro.product.first_api_level' $(intermediate_system_build_prop) > $@
+else
 	$(hide) cat $(intermediate_system_build_prop) > $@
+endif
 ifdef INSTALLED_RECOVERYIMAGE_TARGET
 	$(hide) echo ro.expect.recovery_id=`cat $(RECOVERYIMAGE_ID_FILE)` >> $@
 endif
@@ -372,10 +376,11 @@
     $(FINAL_VENDOR_BUILD_PROPERTIES),=)
 endif  # property_overrides_split_enabled
 
-$(INSTALLED_VENDOR_BUILD_PROP_TARGET): $(VENDOR_BUILDINFO_SH)
+$(INSTALLED_VENDOR_BUILD_PROP_TARGET): $(VENDOR_BUILDINFO_SH) $(intermediate_system_build_prop)
 	@echo Target vendor buildinfo: $@
 	@mkdir -p $(dir $@)
 	$(hide) echo > $@
+	$(hide) grep 'ro.product.first_api_level' $(intermediate_system_build_prop) >> $@ || true
 	$(hide) echo ro.vendor.build.date=`$(DATE_FROM_FILE)`>>$@
 	$(hide) echo ro.vendor.build.date.utc=`$(DATE_FROM_FILE) +%s`>>$@
 	$(hide) echo ro.vendor.build.fingerprint="$(BUILD_FINGERPRINT_FROM_FILE)">>$@