Refactor build information getters and remove the useless code.

Reviewed By: elexis, Stan
Tested By: Stan
Differential Revision: https://code.wildfiregames.com/D1348
This was SVN commit r22035.

binaries/data/mods/public/gui/common/functions_utility.js

@@ -224,3 +224,11 @@ function hideRemaining(parentName, start = 0)
 	for (let i = start; i < objects.length; ++i)
 		objects[i].hidden = true;
 }
+
+function getBuildString()
+{
+	return sprintf(translate("Build: %(buildDate)s (%(revision)s)"), {
+		"buildDate": Engine.GetBuildDate(),
+		"revision": Engine.GetBuildRevision()
+	});
+}

binaries/data/mods/public/gui/pregame/mainmenu.js

@@ -193,14 +193,6 @@ function blendSubmenuIntoMain(topPosition, bottomPosition)
 	Engine.GetGUIObjectByName("MainMenuPanelRightBorderBottom").size = "100%-2 " + (bottomPosition) + " 100% 100%";
 }
 
-function getBuildString()
-{
-	return sprintf(translate("Build: %(buildDate)s (%(revision)s)"), {
-		"buildDate": Engine.GetBuildTimestamp(0),
-		"revision": Engine.GetBuildTimestamp(2)
-	});
-}
-
 function exitGamePressed()
 {
 	closeMenu();

binaries/data/mods/public/gui/session/session.js

@@ -1462,14 +1462,6 @@ function playAmbient()
 	Engine.PlayAmbientSound(pickRandom(g_Ambient), true);
 }
 
-function getBuildString()
-{
-	return sprintf(translate("Build: %(buildDate)s (%(revision)s)"), {
-		"buildDate": Engine.GetBuildTimestamp(0),
-		"revision": Engine.GetBuildTimestamp(2)
-	});
-}
-
 function showTimeWarpMessageBox()
 {
 	messageBox(