[CMake] cd before add_custom_command

[David Somers]

When a command is invoked through ADD_CUSTOM_COMMAND, is it possible to change 
the current directory *before* the command is invoked? (I have need to run 
some programs and these must be run in specific directories - they can't 
simply be run elsewhere and passed the working dircetory as a parameter).

At the moment I'm applying bit of fudge and instead of running the custom 
command directly per se, its actually running a bash script which does a cd 
before running the actual command.

-- 
David Somers
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