Switch to NetBSD utmp.c.

Change-Id: Ibe94888aa48b5b28fea97fd5719a1ed7a23ddeb3
diff --git a/libc/Android.mk b/libc/Android.mk
index d27d204..c9f94a3 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -82,7 +82,6 @@
     bionic/time64.c \
     bionic/umount.c \
     bionic/unlockpt.c \
-    bionic/utmp.c \
     stdio/asprintf.c \
     stdio/findfp.c \
     stdio/fprintf.c \
@@ -279,6 +278,7 @@
     upstream-netbsd/lib/libc/gen/psignal.c \
     upstream-netbsd/lib/libc/gen/setjmperr.c \
     upstream-netbsd/lib/libc/gen/utime.c \
+    upstream-netbsd/lib/libc/gen/utmp.c \
     upstream-netbsd/lib/libc/inet/inet_ntoa.c \
     upstream-netbsd/lib/libc/inet/inet_ntop.c \
     upstream-netbsd/lib/libc/inet/inet_pton.c \