[CMake] Fix typo "Wraning" (NFC)
[CMake] Fix typo "Wraning" (NFC)

Summary:
The typo was added in https://reviews.llvm.org/rL247151.
It should be "warning", not "wraning".



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@314486 91177308-0d34-0410-b5e6-96231b3b80d8

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