Add O MR1 define

Bug: 64394076
Test: none
Change-Id: Ice3991c626dd2cce93c9a571ba529fa5b0129492
diff --git a/libc/include/android/api-level.h b/libc/include/android/api-level.h
index c83c18d..d43f780 100644
--- a/libc/include/android/api-level.h
+++ b/libc/include/android/api-level.h
@@ -55,5 +55,6 @@
 #define __ANDROID_API_N__ 24
 #define __ANDROID_API_N_MR1__ 25
 #define __ANDROID_API_O__ 26
+#define __ANDROID_API_O_MR1__ 27
 
 #endif /* ANDROID_API_LEVEL_H */