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Add minimal test program for fuzzing

diff: cannot open b/fuzzing//null: file does not exist: 'b/fuzzing//null'

--- /dev/null

+++ b/fuzzing/build.sh

@@ -1,0 +1,1 @@

+AFL_HARDEN=1 afl/afl-clang-fast fuzz.c -O2 -o fuzz

--- /dev/null

+++ b/fuzzing/fuzz.c

@@ -1,0 +1,29 @@

+#define MINIMP3_IMPLEMENTATION

+#include "../minimp3.h"

+#include <stdio.h>

+

+int main()

+{

+    static mp3dec_t mp3d;

+    mp3dec_frame_info_t info;

+    int nbuf = 0;

+    unsigned char buf[4096];

+

+    mp3dec_init(&mp3d);

+

+#ifdef __AFL_HAVE_MANUAL_CONTROL

+	__AFL_INIT();

+    while (__AFL_LOOP(1000))

+#endif

+	{

+		do

+	    {

+	        short pcm[MINIMP3_MAX_SAMPLES_PER_FRAME];

+        	nbuf += fread(buf + nbuf, 1, sizeof(buf) - nbuf, stdin);

+	        mp3dec_decode_frame(&mp3d, buf, nbuf, pcm, &info);

+			nbuf -= info.frame_bytes;

+	    } while (info.frame_bytes);

+	}

+

+    return 0;

+}

--- /dev/null

+++ b/fuzzing/fuzz.sh

@@ -1,0 +1,4 @@

+#!/usr/bin/env bash

+cd "${0%/*}"

+

+afl/afl-fuzz -m 50 -i- -o findings/ ./fuzz

--- /dev/null

+++ b/fuzzing/get-afl.sh

@@ -1,0 +1,16 @@

+#!/usr/bin/env bash

+cd "${0%/*}"

+rm afl-latest.tgz

+wget http://lcamtuf.coredump.cx/afl/releases/afl-latest.tgz || exit

+tar -xzvf afl-latest.tgz

+rm afl-latest.tgz

+cd afl-*

+make || exit

+cd llvm_mode

+# may need to prepend LLVM_CONFIG=/usr/bin/llvm-config-3.8 or similar, depending on the system

+make || exit

+cd ../libdislocator

+make || exit

+cd ../..

+rm -rf afl

+mv afl-* afl

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