Update common/webrtc/webrtc-rwlock_null.patch

Move rw_lock_wrapper.h to rtc_base/synchronization/
https://webrtc-review.googlesource.com/21328

patches/common/webrtc/webrtc-rwlock_null.patch

@@ -1,18 +1,17 @@
-diff --git a/system_wrappers/source/rw_lock.cc b/system_wrappers/source/rw_lock.cc
-index c38c44ad75..5ed1912d3f 100644
---- a/system_wrappers/source/rw_lock.cc
-+++ b/system_wrappers/source/rw_lock.cc
-@@ -9,8 +9,10 @@
-  */
- 
- #include "system_wrappers/include/rw_lock_wrapper.h"
-+#include "system_wrappers/include/sleep.h"
+diff --git a/rtc_base/synchronization/rw_lock_wrapper.cc b/rtc_base/synchronization/rw_lock_wrapper.cc
+index c8cd17edb8..50c6e25ad9 100644
+--- a/rtc_base/synchronization/rw_lock_wrapper.cc
++++ b/rtc_base/synchronization/rw_lock_wrapper.cc
+@@ -11,6 +11,9 @@
+ #include "rtc_base/synchronization/rw_lock_wrapper.h"
  
  #include <assert.h>
 +#include <stdlib.h>
++
++#include "system_wrappers/include/sleep.h"
  
  #if defined(_WIN32)
- #include "system_wrappers/source/rw_lock_win.h"
+ #include "rtc_base/synchronization/rw_lock_win.h"
 @@ -21,11 +23,19 @@
  namespace webrtc {