[libc++] Normalize all our '#pragma GCC system_header', and regression-test.
Now we'll notice if a header forgets to include this magic phrase.
Differential Revision: https://reviews.llvm.org/D118800
NOKEYCHECK=True
GitOrigin-RevId: fa6b9e401085c0a210daf81ae79af6dd0144f129
diff --git a/include/cstring b/include/cstring
index 91036f5..acf1c4d 100644
--- a/include/cstring
+++ b/include/cstring
@@ -60,7 +60,7 @@
#include <string.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
+# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD