[CMake] Howto rerun ExternalProject Install

[J Decker]

I have quite a few sub-projects in this project.  I had added a few
projects on windows that statically linked to the runtime (to make the
product more portable).  I realized yesterday that it was causing the
static runtime flags to be applied for all projects above it too (including
the core libraries).  So when I was testing a very high level project that
pulled the C and C++ versions of the same library to have different
runtimes linked (because they each had their own static version).

Anyway to I was replacing add_subdirectory for a few projects with
ExternalProject_add()'s so they would get their own runtime compile
flags.... but if I do a build, and then wipe out the target install
directory and then rerun the install target, the products from the
externalprojects don't re-install.
If I just rerun building those targets, it also doesn't re-install...

So how can I trigger external projects to re-install without figuring out
what sources they depend on and touching them.
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