TCF Agent: fixed: Windows OS name is always displayed as "Windows 8"

There is no good way to get full OS name on Windows.
Starting with Windows 8.1, GetVersionEx returns same version number,
which is retrieved from the application manifest, or 6.2 by default.
As a workaround, OS name reduced to just "Windows".
diff --git a/agent/tcf/framework/mdep.c b/agent/tcf/framework/mdep.c
index e20b04b..d530f89 100644
--- a/agent/tcf/framework/mdep.c
+++ b/agent/tcf/framework/mdep.c
@@ -712,8 +712,9 @@
             if (info.wProductType == VER_NT_WORKSTATION) return "Windows 7";
             return "Windows Server 2008 R2";
         case 2:
-            if (info.wProductType == VER_NT_WORKSTATION) return "Windows 8";
-            return "Windows Server 2012";
+            /* Starting with Windows 8.1, GetVersionEx returns same version number,
+             * which is retrieved from the application manifest, or 6.2 by default. */
+            return "Windows";
         }
     }
     snprintf(str, sizeof(str), "Windows %d.%d", (int)info.dwMajorVersion, (int)info.dwMinorVersion);