Pullup ticket #6187 - requested by tnn
devel/libffi: NetBSD/evbarm build fix

Revisions pulled up:
- devel/libffi/Makefile                                        1.40
- devel/libffi/distinfo                                        1.53
- devel/libffi/patches/patch-src_arm_sysv.S                    1.9

---
  Module Name: pkgsrc
  Committed By: tnn
  Date: Wed Apr  8 13:40:11 UTC 2020

  Modified Files:
  pkgsrc/devel/libffi: Makefile distinfo
  Added Files:
  pkgsrc/devel/libffi/patches: patch-src_arm_sysv.S

  Log Message:
  libffi: fix ARM build

  Restore ifdef toggling .eh_frame exception unwinding.
  Seems to have been lost in previous update. PR pkg/55107. Bump.

(bsiegert)