Fix Debian 9 build. (#1348)
Fix Debian 9 build. (#1348)


GoogleCloudPlatform/compute-image-import,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-tools,zmarano/compute-image-tools,GoogleCloudPlatform/compute-image-import,GoogleCloudPlatform/compute-image-tools,GoogleCloudPlatform/compute-daisy,adjackura/compute-image-tools,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-tools,zmarano/compute-image-tools,zmarano/compute-image-tools,GoogleCloudPlatform/compute-image-import,adjackura/compute-image-tools