Help: Add release notes for Fujitsu compiler support

Help/release/dev/fujitsu-compiler-support.rst

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+fujitsu-compiler-support
+------------------------
+
+* Addition of the ``Fujitsu`` compiler ID operating in traditional ``Trad``
+  mode and ``FujitsuClang`` operating in ``Clang`` mode.
+* The :module:`FindOpenMP` module learned to support ``Fujitsu`` and
+  ``FujitsuClang``.
+* The :module:`FindMPI` module learned to support ``Fujitsu`` and
+  ``FujitsuClang`` in both host and cross compiling modes.
+* The :module:`FindBLAS` and :module:`FindLAPACK` modules learned to support
+  the serial ``Fujitsu SSL2`` and parallel ``Fujitsu SSL2BLAMP`` libraries.