dns2tcp: fix duplicate symbol debug

Error:

ld: error: duplicate symbol: debug
>>> defined at rr.c
>>>            rr.o:(debug)
>>> defined at main.c
>>>            main.o:(.bss+0x0)

happen when trying to build with android-ndk r22 or r23.
More info: https://go-review.googlesource.com/c/go/+/280312

packages/dns2tcp/build.sh

@@ -3,6 +3,7 @@ TERMUX_PKG_DESCRIPTION="dns2tcp is a tool for relaying TCP connections over DNS"
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_MAINTAINER="Marlin Sööse <marlin.soose@laro.se>"
 TERMUX_PKG_VERSION=0.5.2
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://github.com/alex-sector/dns2tcp/archive/v${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_SHA256=4f6e0ed0f5a1aa079a4d377c6d2b16da8ddcffae7d1ddad1280c3e209ada410c
 TERMUX_PKG_BUILD_IN_SRC="true"

packages/dns2tcp/duplicate_symbol.patch

@@ -0,0 +1,11 @@
+--- ./common/includes/debug.h.orig	2021-08-19 17:33:25.204243470 +0200
++++ ./common/includes/debug.h	2021-08-19 17:33:31.160911682 +0200
+@@ -24,7 +24,7 @@
+ #include <stdio.h>
+ #include <time.h>
+
+-int debug;
++int debug __attribute__((common));
+
+ #ifndef _WIN32
+ #define DPRINTF(level, fmt, args...)  \