The `BOOST_LITTLE_ENDIAN` and `BOOST_BIG_ENDIAN` macros, along with the
"boost/detail/endian.hpp" header, were deprecated in boost 1.69.0 and finally
removed in boost 1.73.0.  They are superseded by the BOOST_ENDIAN_LITTLE_BYTE
and BOOST_ENDIAN_BIG_BYTE macros and "boost/predef/other/endian.h" header.

Deprecated: https://github.com/boostorg/predef/commit/32d4581c1689370444f2e565cfbb8421d5071807
Removed:    https://github.com/boostorg/predef/commit/aa6e232bf170ad8b856aff9e7c70334f77441c7f

Adaptation of patch from https://bitbucket.org/fenics-project/dolfin/issues/1116

--- a/dolfin/io/VTKFile.cpp
+++ b/dolfin/io/VTKFile.cpp
@@ -20,7 +20,7 @@
 #include <vector>
 #include <iomanip>
 #include <boost/cstdint.hpp>
-#include <boost/detail/endian.hpp>
+#include <boost/predef/other/endian.h>
 
 #include "pugixml.hpp"
 
@@ -614,9 +614,9 @@
   std::string endianness = "";
   if (encode_string == "binary")
   {
-    #if defined BOOST_LITTLE_ENDIAN
+    #if defined BOOST_ENDIAN_LITTLE_BYTE
     endianness = "byte_order=\"LittleEndian\"";
-    #elif defined BOOST_BIG_ENDIAN
+    #elif defined BOOST_ENDIAN_BIG_BYTE
     endianness = "byte_order=\"BigEndian\"";;
     #else
     dolfin_error("VTKFile.cpp",

--- a/dolfin/io/VTKWriter.cpp
+++ b/dolfin/io/VTKWriter.cpp
@@ -24,7 +24,6 @@
 #include <sstream>
 #include <vector>
 #include <iomanip>
-#include <boost/detail/endian.hpp>

 #include <dolfin/fem/GenericDofMap.h>
 #include <dolfin/fem/FiniteElement.h>
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<div class='path'>path: <a href='/guix/log/?id=7c56811c0468f9f843079eb91b2d925793b6ff5f'>root</a>/<a href='/guix/log/nix?id=7c56811c0468f9f843079eb91b2d925793b6ff5f'>nix</a>/<a href='/guix/log/nix/boost?id=7c56811c0468f9f843079eb91b2d925793b6ff5f'>boost</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/nix/boost?id=7c56811c0468f9f843079eb91b2d925793b6ff5f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-06-24 19:55:22 +0100'>2020-06-24</span></td><td><a href='/guix/commit/nix/boost?id=cd43b55da7ab51c996a7a3449c78f2a493616106'>nix: Tweak .gitignore files.</a><span class='msg-avail'>...<span class='msg-tooltip'>Remove .gitignore entries where they match source files that are tracked in
Git.  This is relevant to me at least, as some code searching tools use
.gitignore files and will ignore matched files.
</span></span></td><td>Christopher Baines</td></tr>