bonnie++: update to 2.00a

Add custom meson build since the Makefile requires too much patching
anyway.

Stop using uClibc++. It will be removed in the near future.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

utils/bonnie++/patches/101-fix-wrong-printf-off_t-format.patch

@@ -0,0 +1,31 @@
+From 4f4d854b7758da89ced4dc800fcbec11667d61c8 Mon Sep 17 00:00:00 2001
+From: Rosen Penev <rosenp@gmail.com>
+Date: Mon, 22 Feb 2021 16:05:54 -0800
+Subject: [PATCH] fix wrong printf off_t format
+
+It's long vs. long long. There's a macro for this.
+
+Signed-off-by: Rosen Penev <rosenp@gmail.com>
+---
+ port.h | 5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+--- a/port.h
++++ b/port.h
+@@ -3,14 +3,13 @@
+ 
+ #include "conf.h"
+ 
+-
+-
++#include <inttypes.h>
+ 
+ #ifndef _LARGEFILE64_SOURCE
+ #define _LARGEFILE64_SOURCE
+ #endif
+ #ifdef _LARGEFILE64_SOURCE
+-#define OFF_T_PRINTF "%lld"
++#define OFF_T_PRINTF "%" PRId64
+ #else
+ #define OFF_T_PRINTF "%d"
+ #endif