libffi: enable pic (#44970)

Co-authored-by: Harmen Stoppels <harmenstoppels@gmail.com>

var/spack/repos/builtin/packages/libffi/package.py

@@ -58,7 +58,7 @@ def flag_handler(self, name, flags):
         return (flags, None, None)
 
     def configure_args(self):
-        args = []
+        args = ["--with-pic"]
         if self.spec.version >= Version("3.3"):
             # Spack adds its own target flags, so tell libffi not to
             # second-guess us