Karsten Sperling 0244513838 ExternalProject: Do not trip over pre-existing 'cmd' variable ...

Callers of `_ep_get_build_command` do not initialize the output variable
they pass and expect the function to unconditionally set it.  Revise the
function to not check its own output variable.  Otherwise if a `cmd`
variable happens to be set when `ExternalProject_Add` is called then it
will be erroneously used as the default `BUILD`, `TEST`, and `INSTALL`
command.

2016-11-17 13:40:29 -05:00

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