bug#69525: 30.0.50; MacOS: New warnings on stderr

[Gerd Möllmann]

The following warnings are printed to stderr, which I haven't seen
previously. Maybe canBecomeKeyWindow should be implemented?

2024-03-03 17:10:16.334906+0100 emacs[12805:61381] [Window] Warning: -[NSWindow 
makeKeyWindow] called on EmacsWindow 0x7f7d90a34030 which returned NO from 
-[NSWindow canBecomeKeyWindow].
2024-03-03 17:10:35.434255+0100 emacs[12805:61381] [CursorUI] 
-[TUINSCursorUIController activate:]: EmacsView doesn't conform to 
NSTextInputClient protocol.
2024-03-03 17:10:37.073109+0100 emacs[12805:61381] [Window] Warning: -[NSWindow 
makeKeyWindow] called on EmacsWindow 0x7f7d90a34030 which returned NO from 
-[NSWindow canBecomeKeyWindow].
2024-03-03 17:13:19.141805+0100 emacs[12805:61381] [CursorUI] 
-[TUINSCursorUIController activate:]: EmacsView doesn't conform to 
NSTextInputClient protocol.

In GNU Emacs 30.0.50 (build 1, x86_64-apple-darwin23.3.0, NS
 appkit-2487.40 Version 14.3.1 (Build 23D60)) of 2024-03-01 built on
 Pro.fritz.box
Repository revision: 862dfef88d8e62d12bac3ca2e44e035a2ff5b298
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2487
System Description:  macOS 14.3.1