neon: stop using #pragma GCC system_header

... it breaks dependency generation.

Change-Id: I524f1789c32a633e8930a4e36a893ce02de66390

external/neon/neon.patch

@@ -174,19 +174,6 @@
  	    ctx->found = 1;
  	}
      }
---- src/ne_locks.h	2006-01-02 12:43:19.000000000 +0100
-+++ src/ne_locks.h	2011-02-03 10:26:21.000000000 +0100
-@@ -22,6 +22,10 @@
- #ifndef NE_LOCKS_H
- #define NE_LOCKS_H
- 
-+# if defined __GNUC__
-+# pragma GCC system_header
-+# endif
-+
- #include "ne_request.h" /* for ne_session + ne_request */
- #include "ne_uri.h" /* for ne_uri */
- 
 --- src/ne_sspi.c	2007-08-10 17:26:08.000000000 +0200
 +++ src/ne_sspi.c	2011-02-03 10:26:21.000000000 +0100
 @@ -206,6 +206,45 @@

ucb/source/ucp/webdav-neon/NeonLockStore.cxx

@@ -27,7 +27,6 @@
  ************************************************************************/
 
 
-#include <ne_locks.h>
 #include <ne_uri.h>
 #include "rtl/ustring.hxx"
 #include "osl/time.h"

ucb/source/ucp/webdav-neon/NeonTypes.hxx

@@ -34,7 +34,15 @@
 #include <ne_utils.h>
 #include <ne_basic.h>
 #include <ne_props.h>
+
+#if defined(__GNUC__) && HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wshadow"
+#endif
 #include <ne_locks.h>
+#if defined(__GNUC__) && HAVE_GCC_PRAGMA_DIAGNOSTIC_SCOPE
+# pragma GCC diagnostic pop
+#endif
 
 typedef ne_session                  HttpSession;
 typedef ne_status                   HttpStatus;