Sync with upstream NetBSD lib/libc/regex.

Bug: http://b/22850181
Change-Id: I11a51a2031e68a953ccd5691da98c699c7d01904
diff --git a/libc/Android.mk b/libc/Android.mk
index 4b98ee7..85caa3e 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -317,6 +317,7 @@
     upstream-netbsd/lib/libc/stdlib/nrand48.c \
     upstream-netbsd/lib/libc/stdlib/_rand48.c \
     upstream-netbsd/lib/libc/stdlib/rand_r.c \
+    upstream-netbsd/lib/libc/stdlib/reallocarr.c \
     upstream-netbsd/lib/libc/stdlib/seed48.c \
     upstream-netbsd/lib/libc/stdlib/srand48.c \
     upstream-netbsd/lib/libc/string/memccpy.c \