unix: conditionally copy libffi archive to Python build environment

Author: indygreg

cpython-unix/build.py

@@ -823,7 +823,6 @@ def build_cpython(
         # TODO support bdb/gdbm toggle
         packages = {
             "bzip2",
-            "libffi",
             "xz",
             "zlib",
         }
@@ -836,6 +835,10 @@ def build_cpython(
         if libedit:
             packages.add("libedit")
 
+        libffi = target_triple not in ("aarch64-apple-ios", "x86_64-apple-ios")
+        if libffi:
+            packages.add("libffi")
+
         if libressl:
             packages.add("libressl")
         else: