devel/cvs-devel: fix build on armv7

Same issue as was previously fixed in 36fcf661b for devel/blame.
A 64 bit time_t with a 32 bit long confuses the gnulib mktime.c
implementation. Apply the same upstream patch to fix the build.

Obtained from: 36fcf661ba23c96004395f6ee52cf2e6133b31f0
MFH: 2026Q2
Approved by: portmgr (build fix blanket)

(cherry picked from commit 978896a191d705a495efbaf98f3d8e1e47b68ef8)