Remove ANDROID_LOG_RDONLY

This macro hasn't been meaningful in years.

Test: logging unit tests
Change-Id: I849a466052524c24f1dba585a6423e80198c6b9c
diff --git a/libc/malloc_debug/tests/malloc_debug_system_tests.cpp b/libc/malloc_debug/tests/malloc_debug_system_tests.cpp
index 9e612f0..dd569fd 100644
--- a/libc/malloc_debug/tests/malloc_debug_system_tests.cpp
+++ b/libc/malloc_debug/tests/malloc_debug_system_tests.cpp
@@ -150,7 +150,7 @@
   log_str->clear();
 
   logger_list* list;
-  list = android_logger_list_open(log, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, 1000, pid);
+  list = android_logger_list_open(log, ANDROID_LOG_NONBLOCK, 1000, pid);
   ASSERT_TRUE(list != nullptr);
 
   while (true) {