[CMake] math(EXPR) and unary operators

[Rolf Eike Beer]

George Koehler wrote:
> math(EXPR) rejects expressions with negative numbers. This is awful
> because math() can reject its own negative results. For example, this
> code fails:
> 
>   math(EXPR negative "1 - 2")
>   math(EXPR sum "100 + ${negative}")

If you are touching this file anyway, do you see any chance of teaching it to 
deal with hex numbers, too? When dealing with the OpenSSL version defines I 
found out that this is currently not supported.

Eike
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