Remove unused patch from the repo

The spec file stopped using this patch some time ago.

boost-1.50.0-foreach.patch

@@ -1,60 +0,0 @@
-Index: /trunk/boost/foreach_fwd.hpp
-===================================================================
---- /trunk/boost/foreach_fwd.hpp	(revision 62661)
-+++ /trunk/boost/foreach_fwd.hpp	(revision 75540)
-@@ -15,4 +15,6 @@
- #define BOOST_FOREACH_FWD_HPP
- 
-+#include <utility> // for std::pair
-+
- // This must be at global scope, hence the uglified name
- enum boost_foreach_argument_dependent_lookup_hack
-@@ -26,4 +28,7 @@
- namespace foreach
- {
-+    template<typename T>
-+    std::pair<T, T> in_range(T begin, T end);
-+
-     ///////////////////////////////////////////////////////////////////////////////
-     // boost::foreach::tag
-@@ -47,4 +52,22 @@
- } // namespace foreach
- 
-+// Workaround for unfortunate https://svn.boost.org/trac/boost/ticket/6131
-+namespace BOOST_FOREACH
-+{
-+    using foreach::in_range;
-+    using foreach::tag;
-+
-+    template<typename T>
-+    struct is_lightweight_proxy
-+      : foreach::is_lightweight_proxy<T>
-+    {};
-+
-+    template<typename T>
-+    struct is_noncopyable
-+      : foreach::is_noncopyable<T>
-+    {};
-+
-+} // namespace BOOST_FOREACH
-+
- } // namespace boost
- 
-Index: /trunk/boost/foreach.hpp
-===================================================================
---- /trunk/boost/foreach.hpp	(revision 75077)
-+++ /trunk/boost/foreach.hpp	(revision 75540)
-@@ -166,5 +166,5 @@
- //   at the global namespace for your type.
- template<typename T>
--inline boost::foreach::is_lightweight_proxy<T> *
-+inline boost::BOOST_FOREACH::is_lightweight_proxy<T> *
- boost_foreach_is_lightweight_proxy(T *&, BOOST_FOREACH_TAG_DEFAULT) { return 0; }
- 
-@@ -191,5 +191,5 @@
- //   at the global namespace for your type.
- template<typename T>
--inline boost::foreach::is_noncopyable<T> *
-+inline boost::BOOST_FOREACH::is_noncopyable<T> *
- boost_foreach_is_noncopyable(T *&, BOOST_FOREACH_TAG_DEFAULT) { return 0; }
-