Add cgal mpfr and gmp for msvc with prebuilt binaries.

deps/MPFR/mpfr/mpfr.README

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+Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MPFR Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
+http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+
+##############################################################################
+
+The GNU MPFR distribution contains the following files:
+(This does not apply to code retrieved by Subversion.)
+
+AUTHORS         - the authors of the library
+BUGS            - bugs in MPFR - please read this file!
+COPYING         - the GNU General Public License, version 3
+COPYING.LESSER  - the GNU Lesser General Public License, version 3
+ChangeLog       - the log of changes
+FAQ.html        - frequently asked questions about MPFR
+INSTALL         - how to install MPFR (see also mpfr.texi)
+Makefile*       - files for building the library
+NEWS            - new features with respect to previous versions
+PATCHES         - empty file (until patches are applied)
+README          - this file
+TODO            - what remains to do (any help is welcome!)
+VERSION         - version of MPFR (next release version if taken by Subversion)
+ac*.m4          - automatic configuration files
+ansi2knr.*      - convert ANSI C to Kernighan & Ritchie C (source and man page)
+*.c             - source files
+*.h             - header files
+compile         - auxiliary installation file
+config.*        - auxiliary installation files
+configure*      - configuration files
+depcomp         - auxiliary installation file
+examples/       - directory containing examples
+fdl.texi        - the GNU Free Documentation License
+get_patches.sh  - rebuild get_patches.c when patches have been applied
+install-sh      - installation file
+ltmain.sh       - auxiliary installation file
+m4/             - directory containing additional configuration files
+missing         - auxiliary installation file
+mparam_h.in     - header file template
+mpfr.info       - info file for MPFR
+mpfr.texi       - texinfo documentation for MPFR (source)
+tests/          - test directory
+texinfo.tex     - TeX macros to handle mpfr.texi
+
+According to the special exception to the GNU General Public License,
+the autotools files compile, config.sub, config.guess, ltmain.sh,
+m4/libtool.m4 and missing are distributed under the same licence of
+GNU MPFR.
+
+
+You can get the latest source code by Subversion at InriaGforge:
+
+  svn checkout svn://scm.gforge.inria.fr/svn/mpfr/trunk mpfr
+
+or
+
+  svn checkout https://scm.gforge.inria.fr/svn/mpfr/trunk mpfr
+
+(the last argument can be any directory name). You can use
+
+  svn ls svn://scm.gforge.inria.fr/svn/mpfr/branches
+  svn ls svn://scm.gforge.inria.fr/svn/mpfr/tags
+
+to get the list of branches or tags (releases), then checkout a
+particular branch or tag instead of the trunk. Alternatively, you
+can now use the "https:" scheme (a.k.a. DAV) instead of "svn:".
+For more information about Subversion, please see:
+
+  * http://svnbook.red-bean.com/ (the official Subversion book);
+  * http://gcc.gnu.org/wiki/SvnHelp (written for GCC developers,
+    but interesting general information can be found there);
+  * http://subversion.tigris.org/faq.html (the Subversion FAQ).
+
+Subversion users should read the file "README.dev".
+
+Note: the old CVS repository at cvs-sop.inria.fr is now closed.