[CMake] Do build after GIT_TAG changed in ExternalProject_Add

[typ1232]

Hello,

The command is used as follows:

INCLUDE(ExternalProject)
ExternalProject_Add(name
    GIT_REPOSITORY https://bitbucket.org/foo/bar.git
    GIT_TAG 0fcae6c2c975b309b38b8c84ac681b6bf3ae12e7
    CMAKE_ARGS ""
    INSTALL_COMMAND ""
)
This downloads and builds the project successfully, but if I change the
GIT_TAG value, cmake only checks out the other commit. The project is not
rebuilt.



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