install x86 vcredist only if it is necessary

Change-Id: I7d3b3aa35ceef3502c6b4250b60a572631a117be
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

dist/installer/ifw/packages/org.qtproject.qtcreator.application/meta/installscript.qs

@@ -157,7 +157,14 @@ Component.prototype.createOperations = function()
                                 component.qtCreatorBinaryPath,
                                 "@StartMenuDir@/Qt Creator.lnk",
                                 "workingDirectory=@homeDir@" );
-        component.addElevatedOperation("Execute", "{0,3010,1638}", "@TargetDir@\\lib\\vcredist_msvc2010\\vcredist_x86.exe", "/norestart", "/q");
+
+        // only install c runtime if it is needed, no minor version check of the c runtime till we need it
+        if (installer.value("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\VisualStudio\\10.0\\VC\\VCRedist\\x86\\Installed") != 1) {
+           // return value 3010 means it need a reboot, but in most cases it is not needed for run Qt application
+           // return value 5100 means there's a newer version of the runtime already installed
+           component.addElevatedOperation("Execute", "{0,1638,3010,5100}", "@TargetDir@\\lib\\vcredist_msvc2010\\vcredist_x86.exe", "/norestart", "/q");
+        }
+
         registerWindowsFileTypeExtensions();
 
         if (component.userInterface("AssociateCommonFiletypesForm").AssociateCommonFiletypesCheckBox