[CMake] Add OPTIONAL to install(DIRECTORY ...)

[Steven Wilson]

Currently install(FILES ...) and install(PROGRAMS ...) allow the OPTIONAL
modifier. Directories can also be optional install items.

install(DIRECTORY dirs... DESTINATION <dir>
          [FILE_PERMISSIONS permissions...]
          [DIRECTORY_PERMISSIONS permissions...]
          [USE_SOURCE_PERMISSIONS]
          [CONFIGURATIONS [Debug|Release|...]]
          [COMPONENT <component>] [FILES_MATCHING]
          [[PATTERN <pattern> | REGEX <regex>]
           [EXCLUDE] [PERMISSIONS permissions...]]
          [OPTIONAL] [...])

I have submitted this request as bug # 8743 to the bug tracker and would
like to see this issue integrated into the next release of CMake.

Thanks,

Steve
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