PR libstdc++/88749 fix build failure in src/filesystem/ops.cc

	PR libstdc++/88749
	* src/filesystem/ops.cc (last_write_time): Fix preprocessor condition
	to match the one that controls whether utimbuf and utime are declared.

From-SVN: r267705

libstdc++-v3/ChangeLog

+2019-01-08  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/88749
+	* src/filesystem/ops.cc (last_write_time): Fix preprocessor condition
+	to match the one that controls whether utimbuf and utime are declared.
+
 2019-01-07  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/87787

libstdc++-v3/src/filesystem/ops.cc

@@ -909,7 +909,7 @@ fs::last_write_time(const path& p __attribute__((__unused__)),
     ec.assign(errno, std::generic_category());
   else
     ec.clear();
-#elif _GLIBCXX_HAVE_UTIME_H
+#elif _GLIBCXX_USE_UTIME && _GLIBCXX_HAVE_SYS_STAT_H
   posix::utimbuf times;
   times.modtime = s.count();
   times.actime = do_stat(p, ec, [](const auto& st) { return st.st_atime; },