Alias platform=javascript SCons option to platform=web

[Calinou]

• Follow-up to [3.x] Alias platform=web SCons option to platform=javascript #84978.

This makes build scripts backward-compatible, as was already done for other platforms that were renamed in 4.0.

[akien-mga]

Looking at the logic for existing checks, it seems the macOS and iOS checks wrongly check for ios and macos being used. Those are already correct and they just get reassigned the same value, so they should simply not be a match.

We could consider refactoring that code a bit to use a dictionary of remappings, not sure if that would save lines of code though.

[Calinou]

Looking at the logic for existing checks, it seems the macOS and iOS checks wrongly check for ios and macos being used. Those are already correct and they just get reassigned the same value, so they should simply not be a match.

Fixed.

[YuriSizov]

Thanks!