Upgrade to current vfprintf.

This gets us various bug fixes and missing C99 functionality.

Bug: https://code.google.com/p/android/issues/detail?id=64886
Change-Id: Ie9f8ac569e9b5eec1e4a1faacfe2c21662eaf895
diff --git a/libc/Android.mk b/libc/Android.mk
index fd14232..10b751d 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -79,7 +79,6 @@
     stdio/fvwrite.c \
     stdio/snprintf.c\
     stdio/sprintf.c \
-    stdio/vfprintf.c \
     stdlib/atexit.c \
     stdlib/ctype_.c \
     stdlib/getenv.c \
@@ -394,6 +393,7 @@
     upstream-openbsd/lib/libc/stdio/tmpnam.c \
     upstream-openbsd/lib/libc/stdio/ungetc.c \
     upstream-openbsd/lib/libc/stdio/vasprintf.c \
+    upstream-openbsd/lib/libc/stdio/vfprintf.c \
     upstream-openbsd/lib/libc/stdio/vfscanf.c \
     upstream-openbsd/lib/libc/stdio/vprintf.c \
     upstream-openbsd/lib/libc/stdio/vscanf.c \