dev-libs/boost: Silence <boost/bind.hpp> warning

Package-Manager: Portage-2.3.100, Repoman-2.3.22
Signed-off-by: David Seifert <soap@gentoo.org>

dev-libs/boost/boost-1.73.0.ebuild

@@ -57,6 +57,8 @@ PATCHES=(
 	"${FILESDIR}"/${PN}-1.73-boost-python-cleanup.patch
 	# Boost.MPI's __init__.py doesn't work on Py3
 	"${FILESDIR}"/${PN}-1.73-boost-mpi-python-PEP-328.patch
+	# Remove annoying #pragma message
+	"${FILESDIR}"/${PN}-1.73-property-tree-include.patch
 )
 
 python_bindings_needed() {

dev-libs/boost/files/boost-1.73-property-tree-include.patch

@@ -0,0 +1,45 @@
+From d1c8825a45a0717e1ad79583d3283b0e5e32831e Mon Sep 17 00:00:00 2001
+From: Andrey Semashev <Lastique@users.noreply.github.com>
+Date: Tue, 28 Apr 2020 22:03:04 +0300
+Subject: [PATCH] Fix usage of deprecated Boost.Bind features
+
+This fixes deprecation warnings generated by boost/bind.hpp.
+
+Also, use a more actual include path for ref.hpp.
+---
+ boost/property_tree/json_parser/detail/parser.hpp | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/boost/property_tree/json_parser/detail/parser.hpp b/boost/property_tree/json_parser/detail/parser.hpp
+index 5554990fb..6cf636394 100644
+--- a/boost/property_tree/json_parser/detail/parser.hpp
++++ b/boost/property_tree/json_parser/detail/parser.hpp
+@@ -3,8 +3,8 @@
+ 
+ #include <boost/property_tree/json_parser/error.hpp>
+ 
+-#include <boost/ref.hpp>
+-#include <boost/bind.hpp>
++#include <boost/core/ref.hpp>
++#include <boost/bind/bind.hpp>
+ #include <boost/format.hpp>
+ 
+ #include <iterator>
+@@ -214,7 +214,7 @@ namespace boost { namespace property_tree {
+         void process_codepoint(Sentinel end, EncodingErrorFn error_fn) {
+             encoding.transcode_codepoint(cur, end,
+                 boost::bind(&Callbacks::on_code_unit,
+-                            boost::ref(callbacks), _1),
++                            boost::ref(callbacks), boost::placeholders::_1),
+                 error_fn);
+         }
+ 
+@@ -517,7 +517,7 @@ namespace boost { namespace property_tree {
+         void feed(unsigned codepoint) {
+             encoding.feed_codepoint(codepoint,
+                                     boost::bind(&Callbacks::on_code_unit,
+-                                                boost::ref(callbacks), _1));
++                                                boost::ref(callbacks), boost::placeholders::_1));
+         }
+ 
+         Callbacks& callbacks;