Jenkinsfile: Remove SSH agent as credentials have been fixed with recent Jenkins Git plugin version.

Jenkinsfile

@@ -58,7 +58,6 @@ def perConfiguration(suffix, f) {
 // We need a Windows Server with Visual Studio 2015, Premake5 and Git on it.
 def doBuild(premakeFlags, configuration) {
 	node("windows") {
-		sshagent (credentials: ["ba9ec261-deff-4fa0-a0e8-5d755f88d035"]) {
 		checkout scm
 
 		premakeHome = "${pwd()}\\tools"
@@ -72,8 +71,6 @@ def doBuild(premakeFlags, configuration) {
 		archiveArtifacts artifacts: "*.dll,*.pdb", fingerprint: true
 		stash name: "iw4x $configuration", includes: "*.dll,*.pdb"
 	}
-
-	}
 }
 
 // For each available configuration generate a normal build and a unit test build.