liblog: add __android_log_close()

Bug: 30963384

(cherry picked from commit df7a4c6bae5f85532d79a93b7d9197a2aab17825)

Change-Id: Iee7cd0db819644299fa086586630e71415643294
diff --git a/include/android/log.h b/include/android/log.h
index 1c171b7..391c826 100644
--- a/include/android/log.h
+++ b/include/android/log.h
@@ -89,6 +89,11 @@
 } android_LogPriority;
 
 /*
+ * Release any logger resources (a new log write will immediately re-acquire)
+ */
+void __android_log_close();
+
+/*
  * Send a simple string to the log.
  */
 int __android_log_write(int prio, const char *tag, const char *text);