Updated GotoBLAS download URL, and no need to register anymore to get it

doc/install.txt

@@ -606,8 +606,8 @@ compile GotoBLAS2 (ATLAS may work too, but was not tested, and is
 usually reported to be slower and more difficult to compile -- especially
 on Windows).
 GotoBLAS2 can be downloaded
-`here <http://www.tacc.utexas.edu/tacc-projects/gotoblas2/downloads>`__
-after registering on the website (we tested v1.13).
+`here <http://cms.tacc.utexas.edu/tacc-projects/gotoblas2/downloads/>`__
+(we tested v1.13).
 To compile it, you will also need MSYS and Perl (installation steps are
 described below).
 The GotoBLAS makefiles actually expect a full UNIX environment (like