mosh: fix crashes from out-of-sync timestamps

[carlocab]

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Let's apply the patches from mobile-shell/mosh#1124 that are intended to
fix mobile-shell/mosh#1014. The patch makes sense, and several users
have successfully used the patch for quite some time now.

Fixes Homebrew/discussions#2583.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.