libc++: fix typo

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@262771 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9387f7c..b21e295 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -251,7 +251,7 @@
 # Setup Compiler Flags
 #===============================================================================
 
-include(HandleLibCXXABI) # Steup the ABI library flags
+include(HandleLibCXXABI) # Setup the ABI library flags
 
 # Include macros for adding and removing libc++ flags.
 include(HandleLibcxxFlags)