Update header versions for NDK platform fixes.

Bug: http://b/28178111
Change-Id: Icd638673b409aa43a91490f77c6b4d79c9ea20d9
diff --git a/libc/include/sys/personality.h b/libc/include/sys/personality.h
index 68ae77c..15a5e68 100644
--- a/libc/include/sys/personality.h
+++ b/libc/include/sys/personality.h
@@ -34,7 +34,7 @@
 
 __BEGIN_DECLS
 
-extern int personality(unsigned int persona) __INTRODUCED_IN(21);
+extern int personality(unsigned int persona) __INTRODUCED_IN(15);
 
 __END_DECLS