Set the version to 2.5.1... Yeap! Back from 2.7.0 (not a misprint)

indra/llcommon/llversionviewer.h

@@ -28,8 +28,8 @@
 #define LL_LLVERSIONVIEWER_H
 
 const S32 LL_VERSION_MAJOR = 2;
-const S32 LL_VERSION_MINOR = 7;
-const S32 LL_VERSION_PATCH = 0;
+const S32 LL_VERSION_MINOR = 5;
+const S32 LL_VERSION_PATCH = 1;
 const S32 LL_VERSION_BUILD = 0;
 
 const char * const LL_CHANNEL = "Second Life Developer";