Bug 562937 - Jenkins SWT builds can be made faster with shallow clones

Shallow clone of swt.binaries repo.

Change-Id: Ie02b4c6a902433179c7d729148b5712f489d591c
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.swt/+/191018
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
diff --git a/Jenkinsfile b/Jenkinsfile
index af5cd6e..8bb3fb8 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -87,7 +87,7 @@
 						checkout scm
 					}
 					dir ('eclipse.platform.swt.binaries') {
-					    checkout([$class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'CloneOption', timeout: 120]], submoduleCfg: [], userRemoteConfigs: [[url: 'https://git.eclipse.org/r/platform/eclipse.platform.swt.binaries.git']]])
+					    checkout([$class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'CloneOption', timeout: 120, depth: 1, shallow: true]], submoduleCfg: [], userRemoteConfigs: [[url: 'https://git.eclipse.org/r/platform/eclipse.platform.swt.binaries.git']]])
 					}
 				}
 			}