Fix build with glibc 2.26:

https://github.com/tpaviot/oce/issues/675

Patch copied from upstream source repository:

https://github.com/tpaviot/oce/commit/aa1321e68cc004e3debe38d79ae74581a617c767

From aa1321e68cc004e3debe38d79ae74581a617c767 Mon Sep 17 00:00:00 2001
From: Janus Weil <janus@gcc.gnu.org>
Date: Mon, 18 Dec 2017 11:27:55 +0100
Subject: [PATCH] fix build errors with glibc 2.26+ due to missing xlocale.h
 (issue #675)

* check for the presence of xlocale.h via cmake
* remove related logic from Standard_CLocaleSentry.hxx
---
 CMakeLists.txt                          |  1 +
 src/Standard/Standard_CLocaleSentry.hxx | 15 ---------------
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b782b4101..50e9500b2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -616,6 +616,7 @@ if (NOT WIN32)
 	# compilation anywhere in OCE
 	include(CheckIncludeFile)
 	check_include_file(strings.h HAVE_STRINGS_H)
+	check_include_file(xlocale.h HAVE_XLOCALE_H)
 	include(CheckIncludeFileCXX)
 	check_include_file_cxx(mm_malloc.h HAVE_MM_MALLOC_H)
 	check_include_file_cxx(atomic.h OCE_HAVE_ATOMIC_H)
diff --git a/src/Standard/Standard_CLocaleSentry.hxx b/src/Standard/Standard_CLocaleSentry.hxx
index 2b226e7f3..1a4c1dadc 100644
--- a/src/Standard/Standard_CLocaleSentry.hxx
+++ b/src/Standard/Standard_CLocaleSentry.hxx
@@ -20,21 +20,6 @@
 
 #include <locale.h>
 
-#ifndef HAVE_XLOCALE_H
-  //! "xlocale.h" available in Mac OS X and glibc (Linux) for a long time as an extension
-  //! and become part of POSIX since '2008.
-  //! Notice that this is impossible to test (_POSIX_C_SOURCE >= 200809L)
-  //! since POSIX didn't declared such identifier.
-  #if defined(__APPLE__)
-    #define HAVE_XLOCALE_H
-  #endif
-
-  //! We check _GNU_SOURCE for glibc extensions here and it is always defined by g++ compiler.
-  #if defined(_GNU_SOURCE) && !defined(__ANDROID__)
-    #define HAVE_XLOCALE_H
-  #endif
-#endif // ifndef HAVE_LOCALE_H
-
 #ifdef HAVE_XLOCALE_H
   #include <xlocale.h>
 #endif
-- 
2.15.1

85195e511ac6c5974d9ba9682'>root</a>/<a href='/guix/log/gnu?id=1a7cc9efcd4fd9485195e511ac6c5974d9ba9682'>gnu</a>/<a href='/guix/log/gnu/services?id=1a7cc9efcd4fd9485195e511ac6c5974d9ba9682'>services</a>/<a href='/guix/log/gnu/services/dict.scm?id=1a7cc9efcd4fd9485195e511ac6c5974d9ba9682'>dict.scm</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/gnu/services/dict.scm?id=1a7cc9efcd4fd9485195e511ac6c5974d9ba9682&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-03-07 11:22:41 +0100'>2018-03-07</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=366ddc1ac549efee9acd1fddd30c9baee89ec18a'>services: dicod: Depend on 'user-processes'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-11-22 23:16:01 +0100'>2017-11-22</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=9e549ad1c3a576eed1fb095a2d14613bce83b9ee'>services: dicod: Run in a container.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-16 00:48:08 +0200'>2017-04-16</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=3d3c56500843b5573ba6419db5e66075fb8ac8ef'>services: Add a default value to various service types.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-01 00:45:18 +0200'>2017-04-01</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=9af7ecd9591b4eff41389291bbc586dcf09e2665'>services: dicod: Allow the configuration of "handlers".</a><span class='msg-avail'>...</span></td><td>Huang Ying</td></tr>