[CMake] visual studio parallel build

[Bill Hoffman]

j s wrote:
> To clarify, if my dependencies are properly spelled out correctly for 
> all of my targets, the build order will be handled properly in Visual 
> Studio?
> 

Yes, and if you are running it from the command line, you should build 
the ALL_BUILD target.  Then build the RUN_TESTS.  Currently, the 
RUN_TESTS is expected to be run after the build is done, and should not 
be built before.

-Bill