Figure out what to do about libffi
For some platform GHC depends upon
libffi for foreign call support in the bytecode interpreter. Unfortunately
libffi's upstream seems to be unresponsive and there has not been a release in nearly three years. This means that there is currently no release which has, e.g., support for AArch64 and iOS's compact debug information.
While we obviously want to avoid shipping our own patched libffi, at this point we are starting to run out of options. Consider options for resolving this.