Merge pull request #2463 from jefferyto/host-python-with-system-ffi

python: use external libffi for host python

diff --cc lang/python/Makefile
index 5b60c671400a68225bd6a58fca038491d85a641c,295a3c23d06418cc0ecfc30f18397661a54d5077..20442b3991884e4447d2bc53c2b5de0ccadc93ca
--- 1/lang/python/Makefile
--- 2/lang/python/Makefile
+++ b/lang/python/Makefile
@@@ -221,7 -221,9 +221,8 @@@ HOST_CONFIGURE_ARGS+= 
        --without-cxx-main \
        --without-pymalloc \
        --with-threads \
 -      --prefix=$(STAGING_DIR)/host/usr \
        --with-system-expat=$(STAGING_DIR)/host \
+       --with-system-ffi="$(STAGING_DIR)/host" \
        --with-ensurepip=upgrade \
        CONFIG_SITE= \
        CFLAGS="$(HOST_CFLAGS)"