Update ICU to 58.1

source/acinclude.m4

Index: source/acinclude.m4
diff --git a/source/acinclude.m4 b/source/acinclude.m4
index b64e984b6c3d2852d37f23f86bf156f623275d02..5c8fda71dede219caf16e82302f57e1d8537fb2a 100644
--- a/source/acinclude.m4
+++ b/source/acinclude.m4
@@ -1,4 +1,6 @@
-# Copyright (c) 1999-2015, International Business Machines Corporation and
+# Copyright (C) 2016 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html
+# Copyright (c) 1999-2016, International Business Machines Corporation and
 # others. All Rights Reserved.
 # acinclude.m4 for ICU
 # Don't edit aclocal.m4, do edit acinclude.m4
@@ -461,6 +463,9 @@ AC_DEFUN([AC_CHECK_STRICT_COMPILE],
         if test "$GCC" = yes
         then
             case "${host}" in
+            *-*-solaris*)
+                # Don't use -std=c99 on Solaris because of timezone check fails
+                ;;
             *)
                 # Do not use -ansi. It limits us to C90, and it breaks some platforms.
                 # We use -std=c99 to disable the gnu99 defaults and its associated warnings