Get the full set of PRNG functions in <stdlib.h>

Bug: https://code.google.com/p/android/issues/detail?id=58888
Change-Id: I435250bdae302e8bd7e29977d0fde7b9afbfca5e
diff --git a/libc/Android.mk b/libc/Android.mk
index cd5cb02..30e6419 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -265,6 +265,7 @@
 
 libc_upstream_netbsd_src_files := \
     upstream-netbsd/common/lib/libc/hash/sha1/sha1.c \
+    upstream-netbsd/common/lib/libc/stdlib/random.c \
     upstream-netbsd/lib/libc/gen/ftw.c \
     upstream-netbsd/lib/libc/gen/nftw.c \
     upstream-netbsd/lib/libc/gen/nice.c \
@@ -290,6 +291,8 @@
     upstream-netbsd/lib/libc/stdlib/mrand48.c \
     upstream-netbsd/lib/libc/stdlib/nrand48.c \
     upstream-netbsd/lib/libc/stdlib/_rand48.c \
+    upstream-netbsd/lib/libc/stdlib/rand.c \
+    upstream-netbsd/lib/libc/stdlib/rand_r.c \
     upstream-netbsd/lib/libc/stdlib/seed48.c \
     upstream-netbsd/lib/libc/stdlib/srand48.c \
     upstream-netbsd/lib/libc/stdlib/tdelete.c \