[llvm] Fix typo UNSPPORTED -> UNSUPPORTED

This word was misspelled in c63f258.

Author: halbi2

llvm/cmake/modules/HandleLLVMOptions.cmake

@@ -929,7 +929,7 @@ if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))
   endif()
 
   # Enable -Wctad-maybe-unsupported to catch unintended use of CTAD.
-  add_flag_if_supported("-Wctad-maybe-unsupported" CTAD_MAYBE_UNSPPORTED_FLAG)
+  add_flag_if_supported("-Wctad-maybe-unsupported" CTAD_MAYBE_UNSUPPORTED_FLAG)
 endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))
 
 if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS)