clion mac版升級後不能編譯，顯示missing xcrun等問題解決

該問題可能會在升級mac系統或者clion客戶端後發生，發生error日誌通常以下，大多顯示missing xcrunxcode 問題描述：ui Error:The C compiler "/usr/bin/cc" is not able to compile a simple test program. It fails with the following output: Change Di

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