Cleanup foo.h headers and __config to work in C

llvm-svn: 252274
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 60506cbcd48a905950971f7211ceef1867aa25c8
diff --git a/include/stdlib.h b/include/stdlib.h
index 919faa1..12fd676 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -94,6 +94,7 @@
 #include_next <stdlib.h>
 
 #ifdef __cplusplus
+
 extern "C++" {
 
 #ifdef _LIBCPP_MSVCRT
@@ -123,6 +124,7 @@
 #endif // _LIBCPP_MSVCRT / __sun__ / _AIX
 
 }  // extern "C++"
+
 #endif  // __cplusplus
 
 #endif  // _LIBCPP_STDLIB_H