editors/emacs: Add upstream patch to fix arbitary shell command execution vulnerability

Reviewed by: jrm
MFH: 2023Q1
Security: 76e2fcce-92d2-11ed-a635-080027f5fec9
Differential Revision: https://reviews.freebsd.org/D38033

(cherry picked from commit 2b1ab08852aeaa17767219c50588b407b3c65747)