Include "is old" in the list of possible causes for a MD5 mismatch.

Please let me know if this change is mundane enough to belong in master.

master is only for fixing problems with compiling the game. Anything else should target next (or a different appropriate branch).
Source: https://git.magicalgirl.moe/STJr/SRB2/wikis/which-branch

(There was a time where master was for "netplay-compatible" changes, yes, but that was changed some months ago.)

merged

mentioned in commit 40dc532e

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