fix Wshadow warnings in boost random

upstreamed as https://svn.boost.org/trac/boost/ticket/7774

Change-Id: I73d25ff16733a0b5c61250fdd98bee13b9fb7173

boost/UnpackedTarball_boost.mk

@@ -30,6 +30,8 @@ boost_patches += boost.4100.warnings.patch
 boost_patches += boost.4510.warnings.patch
 #https://svn.boost.org/trac/boost/ticket/6940
 boost_patches += boost.6940.glibc.patch
+#https://svn.boost.org/trac/boost/ticket/7774
+boost_patches += boost.7774.warnings.patch.1
 
 boost_patches += boost.windows.patch
 boost_patches += boost.vc2012.patch

boost/boost.7774.warnings.patch.1

+diff -ur boost.org/boost/random/binomial_distribution.hpp boost/boost/random/binomial_distribution.hpp
+--- boost.org/boost/random/binomial_distribution.hpp	2012-12-07 21:17:45.789067382 +0100
++++ boost/boost/random/binomial_distribution.hpp	2012-12-07 21:42:39.915034045 +0100
+@@ -42,12 +42,12 @@
+    *
+    * Requires: t >=0 && 0 <= p <= 1
+    */
+-  explicit binomial_distribution(IntType t = 1,
+-                                 const RealType& p = RealType(0.5))
+-    : _bernoulli(p), _t(t)
++  explicit binomial_distribution(IntType t_arg = 1,
++                                 const RealType& p_arg = RealType(0.5))
++    : _bernoulli(p_arg), _t(t_arg)
+   {
+     assert(_t >= 0);
+-    assert(RealType(0) <= p && p <= RealType(1));
++    assert(RealType(0) <= p_arg && p_arg <= RealType(1));
+   }
+ 
+   // compiler-generated copy ctor and assignment operator are fine
+diff -ur boost.org/boost/random/geometric_distribution.hpp boost/boost/random/geometric_distribution.hpp
+--- boost.org/boost/random/geometric_distribution.hpp	2012-12-07 21:17:45.789067382 +0100
++++ boost/boost/random/geometric_distribution.hpp	2012-12-07 21:41:34.970035494 +0100
+@@ -50,8 +50,8 @@
+    *
+    * Requires: 0 < p < 1
+    */
+-  explicit geometric_distribution(const RealType& p = RealType(0.5))
+-    : _p(p)
++  explicit geometric_distribution(const RealType& p_arg = RealType(0.5))
++    : _p(p_arg)
+   {
+     assert(RealType(0) < _p && _p < RealType(1));
+     init();