iTerm2 does not build on macOS 10.14

Bug report

iTerm2 does not build on macOS 10.14.6. The error is:

iTerm2-3.4.12/sources/iTermRootTerminalView.m:1251:50: error: property 'safeAreaInsets' not found on object of type
      'iTermRootTerminalView *'
        const NSEdgeInsets safeAreaInsets = self.safeAreaInsets;
                                                 ^
1 error generated.

While I don't know Objective C, it appeared to me that the intention was not to try to use safeAreaInsets on macOS versions prior to 12:

https://github.com/gnachman/iTerm2/blob/master/sources/iTermRootTerminalView.m#L1270

Is building iTerm2 still supported on macOS 10.14?

• iTerm2 version: 3.4.12
• OS version: 10.14.6
• Xcode version: 11.3.1 11C504

Detailed steps to reproduce the problem

1. Downloaded sources from https://github.com/gnachman/iTerm2/releases/tag/v3.4.12
2. Ran make in the source directory

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