Changes to build/SConscript.libffi, prepend include path

Hi!

I got errors during the ctypes libffi build, because the preprocessor
found ffi header files in /usr/local/include before those shipped with
ctypes.

Prepending the path to the internal header files instead of appending
it fixed this issue for me.
-- 
Goetz Isenmann

internal_ffi_headers_first.patch
Description: Text document

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