Ignore csharp-mode on new emacs version

[liuchong]

Refer to https://github.com/emacs-csharp/csharp-mode/blob/02c61c219b2c22491eff9b7315fed661fab423d4/csharp-mode.el#L40-L42, we do not need csharp-mode any more on new emacs versions. Ignore the dependency could avoid the warn message.

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[liuchong]

@microsoft-github-policy-service agree

[looopTools]

Could we get this merged?