Add missing includes for cstring

src/xenia/base/ring_buffer.cc

@@ -9,6 +9,8 @@
 
 #include "xenia/base/ring_buffer.h"
 
+#include <cstring>
+
 namespace xe {
 
 RingBuffer::RingBuffer(uint8_t *raw_buffer, size_t size, size_t write_offset)
@@ -62,4 +64,4 @@ size_t RingBuffer::DistanceToOffset(size_t offset) {
   }
 }
 
-} // namespace xe
+} // namespace xe