build: fix libffi building to the wrong directory (https://github.com/saghul/txiki.js/issues/453) #454
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On systems where
gcc --print-multi-os-directoryoutputs something that is not../lib, Libffi installs to the wrong location (e.g.lib64) where CMake cannot find it and errors, breaking the build. This fix disables placing binaries in other places with the--disable-multi-os-directoryconfiguration flag, forcing Libffi to install tolib.This fix has no effect on systems where Libffi already installs to
lib, and therefore does not break anything.