[CMake] Revision header

[Oliver Smith]

I have a script that generates a revision.h file, I've spent the morning 
trying to figure out how to make it so that ... any time CMake rebuilds 
any of the other targets, it starts by running the make-new-revision script.

The idea is, I use the script manually to upversion, but anytime I type 
"make" and /anything/ has to be done (even just a relink), it will do 
the upversion first.

I've only managed to make it either source dependent or always build, 
which forces the versionNo file to recompile and forces all executables 
to relink, so if you type:

make ; make ... it will have to relink the executables the second time 
because of an pointless upversion :)

- Oliver

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