add empty eden-config.h.in to replace eden-config.h in getdeps builds

Summary: This diffs copies a blank `eden-config.h` file to `eden/common/eden-config.h` so the file will exist at that path if/when it is imported during getdeps builds. This will overwrite the file

Reviewed By: jdelliot

Differential Revision: D62655322

fbshipit-source-id: 411d1164dd0b16bae12bddbbd7ac9c95518fa009

CMake/eden-config.h.in

@@ -0,0 +1,8 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2.
+ */
+
+#pragma once

CMakeLists.txt

@@ -69,6 +69,11 @@ add_subdirectory(eden/common/telemetry)
 add_subdirectory(eden/common/testharness)
 add_subdirectory(eden/common/utils)
 
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/CMake/eden-config.h.in
+  ${CMAKE_CURRENT_SOURCE_DIR}/eden/common/eden-config.h
+)
+
 # Install our own CMake package files for dependent projects.
 include(CMakePackageConfigHelpers)
 configure_package_config_file(