sysutils/packer: Import an upstream patch to fix a runtime issue

https://github.com/rconde01/govmomi/commit/f17e482482daf36650ad75d5f19b65306a03289a
fix: make processing of mac addresses case insensitive

Approved by: portmgr (runtime fix blanket)

(cherry picked from commit 306070e97f5c638aad9e9dd2512948b1f46c3989)