Bug#1091279: w3cam: FTBFS on armhf: cgi.c:96:21: error: passing argument 1 of ‘gmtime’ from incompatible pointer type [-Wincompatible-pointer-types]

[Tj]

Source: w3cam
Followup-For: Bug #1091279
X-Debbugs-Cc: tj.iam...@proton.me
Control: tags -1 + moreinfo

This is a by-product of the time_t64 transition; I'm fixing it and
cleaning up some other build issues at the same time.