linux.mt: Don't define _PTHREADS, but define _IO_MTSAFE_IO.

        * config/linux.mt: Don't define _PTHREADS, but define
        _IO_MTSAFE_IO.

From-SVN: r17581

libstdc++/ChangeLog

+Sun Feb  1 13:38:07 1998  H.J. Lu  (hjl@gnu.org)
+
+	* config/linux.mt: Don't define _PTHREADS, but define
+	_IO_MTSAFE_IO.
+
 Wed Jan 28 10:27:11 1998  Manfred Hollstein  <manfred@s-direktnet.de>
 
         * tests/configure.in, testsuite/configure.in: Update with yesterday's

libstdc++/config/linux.mt

-MT_CFLAGS = -D_PTHREADS
+# tell we want the mt-safe version
+MT_CFLAGS = -D_IO_MTSAFE_IO