[Chicken-hackers] patch to make PROGAM_SUFFIX do the intented thing

[Jörg F. Wittenberger]

Hi,

I tried to use PROGRAM_SUFFIX to install c4 and c5 in parallel using
the same prefix (against the documented suggestions, but it looked more
coherent in my case).

This failed with the include files installed
in .../include/chicken$PROGAM_SUFFIX - which looks to me like the right
thing to do) while csc would give ...include/chicken sans
$PROGRAM_SUFFIX to the C compiler.

The attached patch fixes this.  (Tested so with native and cross
compilation. However only using CHICKEN 4.13.)

Best

/Jörg

install_include_suffix.patch
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