Help: Add notes for topic 'InstallRequiredSystemLibraries-vs-openmp'

Help/release/dev/InstallRequiredSystemLibraries-vs-openmp.rst

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+InstallRequiredSystemLibraries-vs-openmp
+----------------------------------------
+
+* The :module:`InstallRequiredSystemLibraries` module gained a new
+  ``CMAKE_INSTALL_OPENMP_LIBRARIES`` option to install MSVC OpenMP
+  runtime libraries.