ax_boost_{chrono,unit_test_framework}.m4: take changes from upstream

Apply changes to
build-aux/m4/ax_boost_chrono.m4 and
build-aux/m4/ax_boost_unit_test_framework.m4
from upstream: https://github.com/peti/autoconf-archive

build-aux/m4/ax_boost_chrono.m4

@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_boost_chrono.html
+#     https://www.gnu.org/software/autoconf-archive/ax_boost_chrono.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -8,7 +8,7 @@
 #
 # DESCRIPTION
 #
-#   Test for System library from the Boost C++ libraries. The macro requires
+#   Test for Chrono library from the Boost C++ libraries. The macro requires
 #   a preceding call to AX_BOOST_BASE. Further documentation is available at
 #   <http://randspringer.de/boost/index.html>.
 #
@@ -29,7 +29,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 1
+#serial 4
 
 AC_DEFUN([AX_BOOST_CHRONO],
 [
@@ -68,7 +68,7 @@ AC_DEFUN([AX_BOOST_CHRONO],
 			 CXXFLAGS_SAVE=$CXXFLAGS
 
 			 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/chrono.hpp>]],
-                                   [[boost::chrono::system_clock::time_point time;]])],
+                                   [[boost::chrono::system_clock::time_point* time = new boost::chrono::system_clock::time_point; delete time;]])],
                    ax_cv_boost_chrono=yes, ax_cv_boost_chrono=no)
 			 CXXFLAGS=$CXXFLAGS_SAVE
              AC_LANG_POP([C++])

build-aux/m4/ax_boost_unit_test_framework.m4

@@ -1,6 +1,6 @@
-# ================================================================================
-#  http://www.gnu.org/software/autoconf-archive/ax_boost_unit_test_framework.html
-# ================================================================================
+# =================================================================================
+#  https://www.gnu.org/software/autoconf-archive/ax_boost_unit_test_framework.html
+# =================================================================================
 #
 # SYNOPSIS
 #
@@ -29,7 +29,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 19
+#serial 21
 
 AC_DEFUN([AX_BOOST_UNIT_TEST_FRAMEWORK],
 [
@@ -66,7 +66,7 @@ AC_DEFUN([AX_BOOST_UNIT_TEST_FRAMEWORK],
         [AC_LANG_PUSH([C++])
 			 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/test/unit_test.hpp>]],
                                     [[using boost::unit_test::test_suite;
-							 test_suite* test= BOOST_TEST_SUITE( "Unit test example 1" ); return 0;]])],
+							 test_suite* test= BOOST_TEST_SUITE( "Unit test example 1" ); if (test == NULL) { return 1; } else { return 0; }]])],
                    ax_cv_boost_unit_test_framework=yes, ax_cv_boost_unit_test_framework=no)
          AC_LANG_POP([C++])
 		])