[Chicken-users] make clean doesn't remove chicken-config.h and chicken-defaults.h

[Matthew Welland]

The environment where I was trying to build chicken had the $HOST variable 
set to the hostname of the build machine (set in some part of the login 
process, not something I had control over). After I figured that out I was 
able to build by unsetting the HOST env var. However, although I did 
a "make clean" before rebuilding I still couldn't get chicken-setup to work 
because it was trying to run sillyhostname-gcc instead of gcc! This was due 
to the chicken*.h files not being removed by the make clean.

Matt
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