Install MSVC runtime shared libraries (DLL) with cmake

[emmenlau]

The cmake based build currently does not install MSVC shared libraries. This seems to be caused by a rather simple issue: The cmake install command is missing the RUNTIME component (see https://cmake.org/cmake/help/latest/command/install.html#installing-targets). The usual install target directory for the RUNTIME is CMAKE_INSTALL_BINDIR.

This PR adds the RUNTIME component to the install command. This should not have any negative consequences for any users. The only behavioral change should be that the shared library (dll) files will be installed into CMAKE_INSTALL_BINDIR on MSVC, which should be a purely positive effect.

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[terrelln]

Thanks for the PR @emmenlau!

[emmenlau]

Thanks for the quick response!