[scripts] setup5.iss: Add "-xp" suffix to the application version.

Just for the v2.7.1-xp rebuild.

Author: GerbilSoft

scripts/setup5.iss

@@ -5,7 +5,7 @@
 #define MyAppURL "https://github.com/GerbilSoft/rom-properties"
 
 #include "../pkg_windows/build.i386/src/config.version.h"
-#define MyAppVersion RP_VERSION_STRING
+#define MyAppVersion RP_VERSION_STRING-xp
 
 [Setup]
 ; NOTE: The value of AppId uniquely identifies this application. Do not use the same AppId value in installers for other applications.