liblog: stay away from C++ keyword private

Replace with void* private with priv in context structure.

SideEffects: None
Test: gTest liblog-unit-tests
Bug: 27405083
Change-Id: I670cb0b7fb2f3085ea13b4ac836d84239a3c8572
diff --git a/liblog/logger.h b/liblog/logger.h
index 86c75f8..1a39ec0 100644
--- a/liblog/logger.h
+++ b/liblog/logger.h
@@ -30,7 +30,7 @@
 
 /* Union, sock or fd of zero is not allowed unless static initialized */
 union android_log_context {
-  void* private;
+  void* priv;
   atomic_int sock;
   atomic_int fd;
   struct listnode* node;