Log Message:
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.