* include/cpplib.h (struct cpp_options): Fix typo.

From-SVN: r177869
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 30b1e98..4d68fa7 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -315,7 +315,7 @@
   /* Nonzero means process u/U prefix literals (UTF-16/32).  */
   unsigned char uliterals;
 
-  /* Nonzero means process r/R rax strings.  If this is set, uliterals
+  /* Nonzero means process r/R raw strings.  If this is set, uliterals
      must be set as well.  */
   unsigned char rliterals;