boost: fix darwin build

src/boost-1-fixes.patch

@@ -5,7 +5,7 @@ Contains ad hoc patches for cross building.
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: xantares <xantares09@hotmail.com>
 Date: Mon, 28 Sep 2015 08:21:42 +0000
-Subject: [PATCH 1/3] Fix {make,jump}_fcontext visibility with mingw
+Subject: [PATCH 1/4] Fix {make,jump}_fcontext visibility with mingw
 
 taken from: https://github.com/boostorg/context/pull/22
 
@@ -57,7 +57,7 @@ index 1111111..2222222 100644
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Tony Theodore <tonyt@logyst.com>
 Date: Wed, 28 Feb 2018 19:43:45 +1100
-Subject: [PATCH 2/3] fast-forward asio/ssl from 1.62 release
+Subject: [PATCH 2/4] fast-forward asio/ssl from 1.62 release
 
 
 diff --git a/boost/asio/ssl/detail/impl/engine.ipp b/boost/asio/ssl/detail/impl/engine.ipp
@@ -550,7 +550,7 @@ index 1111111..2222222 100644
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: jzmaddock <john@johnmaddock.co.uk>
 Date: Fri, 24 Jul 2015 18:50:28 +0100
-Subject: [PATCH 3/3] Remove depricated type_traits usage.
+Subject: [PATCH 3/4] Remove depricated type_traits usage.
 
 curl -L 'https://patch-diff.githubusercontent.com/raw/boostorg/iostreams/pull/15.patch' | sed 's,include/,,g' | git am
 
@@ -588,3 +588,27 @@ index 1111111..2222222 100644
  } // End namespaces detail, iostreams, boost.
  
  #endif // BOOST_IOSTREAMS_DETAIL_IS_DEREFERENCEABLE_HPP_INCLUDED
+
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tony Theodore <tonyt@logyst.com>
+Date: Wed, 8 Apr 2020 00:37:10 +1000
+Subject: [PATCH 4/4] fix darwin build
+
+
+diff --git a/tools/build/src/tools/darwin.jam b/tools/build/src/tools/darwin.jam
+index 1111111..2222222 100644
+--- a/tools/build/src/tools/darwin.jam
++++ b/tools/build/src/tools/darwin.jam
+@@ -135,12 +135,6 @@ rule init ( version ? : command * : options * : requirement * )
+     
+     # - Set the toolset generic common options.
+     common.handle-options darwin : $(condition) : $(command) : $(options) ;
+-    
+-    # - GCC 4.0 and higher in Darwin does not have -fcoalesce-templates.
+-    if $(real-version) < "4.0.0"
+-    {
+-        flags darwin.compile.c++ OPTIONS $(condition) : -fcoalesce-templates ;
+-    }
+     # - GCC 4.2 and higher in Darwin does not have -Wno-long-double.
+     if $(real-version) < "4.2.0"
+     {