gzip: hotfix for gnulib vasnprintf.c

Don't use %n in vasnprintf.c, it breaks things.

   $ gzip --version
   FORTIFY: %n not allowed on Android
   Aborted

See m4's issue in #4381.

This should be fixed in the next gzip release, though, as gnulib has
been updated in the master branch. However, for now, this will fix
things.

packages/gzip/build.sh

@@ -2,7 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://www.gnu.org/software/gzip/
 TERMUX_PKG_DESCRIPTION="Standard GNU file compression utilities"
 TERMUX_PKG_LICENSE="GPL-3.0"
 TERMUX_PKG_VERSION=1.10
-TERMUX_PKG_REVISION=2
+TERMUX_PKG_REVISION=3
 TERMUX_PKG_SRCURL=https://mirrors.kernel.org/gnu/gzip/gzip-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_SHA256=8425ccac99872d544d4310305f915f5ea81e04d0f437ef1a230dc9d1c819d7c0
 TERMUX_PKG_ESSENTIAL=true

packages/gzip/lib-vasnprintf.c.patch

@@ -0,0 +1,13 @@
+diff -u -r ../gzip-1.10/lib/vasnprintf.c ./lib/vasnprintf.c
+--- ../gzip-1.10/lib/vasnprintf.c	2018-12-21 23:56:16.000000000 -0500
++++ ./lib/vasnprintf.c	2020-04-05 18:21:34.305189418 -0400
+@@ -4874,7 +4874,8 @@
+ # if ! (((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3))        \
+          && !defined __UCLIBC__)                                            \
+         || (defined __APPLE__ && defined __MACH__)                          \
+-        || (defined _WIN32 && ! defined __CYGWIN__))
++        || (defined _WIN32 && ! defined __CYGWIN__)                         \
++        || (defined __ANDROID__))
+                 fbp[1] = '%';
+                 fbp[2] = 'n';
+                 fbp[3] = '\0';