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Rewrite deprecated_cmd_warning to be i18n friendly. While I'm going through the function I also cleaned up some whitespace issues, replaced uses of NULL with nullptr, and moved some comments to avoid having to add { ... }. Though the message being printed has a 'Warning: ' prefix I could have changed from using printf_filtered to use warning, however, I haven't done that in this commit as that would change what GDB outputs and I wanted this commit NOT to change the output. There should be no user visible changes after this commit. gdb/ChangeLog: * cli/cli-decode.c (deprecated_cmd_warning): Use nullptr instead of NULL. Don't print message piece by piece, but sentence at a time to allow internationalisation. Some whitespace cleanup.