gatling: fix builds with NDK r23

Thanks to OpenSSL 3 for making me fix this

packages/gatling/build.sh

@@ -3,6 +3,7 @@ TERMUX_PKG_DESCRIPTION="A high performance http, ftp and smb server"
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=0.15
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://www.fefe.de/gatling/gatling-$TERMUX_PKG_VERSION.tar.xz
 TERMUX_PKG_SHA256=6fa329d0ced0c80deb8dde5460e9d9e984bee94f265043d7fdec0e253dce9aa4
 TERMUX_PKG_DEPENDS="libcrypt, libiconv, openssl, zlib"

packages/gatling/dirfd.h.patch

@@ -0,0 +1,11 @@
+--- ./dirfd.h.orig	2022-02-16 19:00:47.650173530 +0530
++++ ./dirfd.h	2022-02-16 19:01:03.830173524 +0530
+@@ -21,7 +21,7 @@
+  * given dir, and it will return the fd or -1 on error. */
+ 
+ #ifdef __linux__
+-int ifd;	/* inotify fd */
++extern int ifd;	/* inotify fd */
+ #endif
+ 
+ struct dircacheentry {