[CMake] Unnecessary rebuild of ExternalProject_Add target

[Jack Smith]

On Sun, Feb 9, 2014 at 4:10 PM, Jack Smith <smith.jack.sidman at gmail.com>wrote:

>
>
> ExternalProject_Add(
>    grub
>    GIT_REPOSITORY  git://git.savannah.gnu.org/grub.git
>    GIT_TAG grub-2.02-beta2
>    UPDATE_COMMAND ""
>    CONFIGURE_COMMAND  ./autogen.sh && ./configure
>    BUILD_COMMAND make -j 2
>    BUILD_IN_SOURCE 1                                     # What's up with
> that !
>    INSTALL_COMMAND ""
> )
>

My mistake.  Reverting to non-parameterized version of the
ExternalProject_Add has highlighted the fact that my use of

set(PROGRAM_UPDATE_COMMAND "")
UPDATE_COMMAND=${PROGRAM_UPDATE_COMMAND}

results in no update command, rather than an empty update command.  These
are of course different.
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