ChangeLog entry for versioned symbols.

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+2014-12-08  Niels Möller  <nisse@lysator.liu.se>
+
+       From Nikos Mavrogiannopoulos. Support for versioned symbols.
+       * aclocal.m4 (LD_VERSION_SCRIPT): New macro. Substitute
+       EXTRA_LINKER_FLAGS and EXTRA_HOGWEED_LINKER_FLAGS.
+       * configure.ac: Use LD_VERSION_SCRIPT. Generate libnettle.map
+       and libhogweed.map.
+       (HOGWEED_EXTRA_SYMBOLS): New substituted variable.
+       * libnettle.map.in: New file, libnettle.so linker script
+       * libhogweed.map.in: New file, libhogweed.so linker script.
+       * Makefile.in ($(LIBNETTLE_FORLINK)): Use EXTRA_LINKER_FLAGS.
+       ($(LIBHOGWEED_FORLINK)): Use EXTRA_HOGWEED_LINKER_FLAGS.
+
 2014-11-24  Niels Möller  <nisse@lysator.liu.se>
 
        * gcm.h (GCM_SET_KEY): Rename macro argument KEY to avoid