[Chicken-users] CMakeLists.txt patch: fixes error which prevents configuring when no libffi present

[Will M Farr]

Hello all,

I tried to build a new chicken from the latest darcs sources today,  
and I couldn't get past the configure step of CMake.  The problem  
seemed to be that I have no libffi, so the libffi test doesn't build,  
and CMake won't let me go on and [c]onfigure.

I browsed through CMakeLists.txt, and found that when the test  
doesn't build, CMake logs an actual error, rather than simply setting  
a flag not to use libffi and sending a message to the screen.  The  
attached patch (against today's darcs repo) fixes that problem: under  
the patch, when the libffi test doesn't build, CMake simply sets the  
WITHOUT_LIBFFI flag to TRUE, but doesn't report an error which  
derails the entire configuration process.

Thanks,
Will

chicken-CMakeLists.txt.patch
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