Use cross-compiled uploadvalidator on v3.0

With recent changes on stable-3.0, the uploadvalidator on
master is compatible again with both v3.0 and master.

Change-Id: I472584e07b8ce74d677ffec7ba8e1f1b0343453a
diff --git a/fpm/Makefile b/fpm/Makefile
index a71f8d5..81a43a9 100644
--- a/fpm/Makefile
+++ b/fpm/Makefile
@@ -26,7 +26,7 @@
 PLUGINS_JOBS= \
   plugin-plugin-manager-bazel-master-stable-3.0/lastSuccessfulBuild/artifact/bazel-genfiles/plugins/plugin-manager/plugin-manager.jar \
   plugin-avatars-gravatar-bazel-master-stable-3.0/lastSuccessfulBuild/artifact/bazel-genfiles/plugins/avatars-gravatar/avatars-gravatar.jar \
-  plugin-uploadvalidator-bazel-stable-3.0/lastSuccessfulBuild/artifact/bazel-genfiles/plugins/uploadvalidator/uploadvalidator.jar
+  plugin-uploadvalidator-bazel-master-stable-3.0/lastSuccessfulBuild/artifact/bazel-genfiles/plugins/uploadvalidator/uploadvalidator.jar
 
 RPM_OUT=$(OUT)/gerrit-$(VERSION)-$(RELEASE).$(BUILD_ARCH).rpm
 DEB_OUT=$(OUT)/gerrit-$(VERSION)-$(RELEASE).$(BUILD_ARCH).deb