DLL install fix for https://github.com/facebook/zstd/issues/2160

Credit goes to @xantares

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build/cmake/lib/CMakeLists.txt

@@ -161,6 +161,7 @@ install(TARGETS ${library_targets}
     INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
     ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
     LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
     )
 
 # uninstall target