apt: Do not overwrite sources.list automatically

- Add etc/apt/sources.list to conffiles. Closes #148.
- Update from apt 1.2.3 to 1.2.4.

packages/apt/build.sh

@@ -1,13 +1,14 @@
 TERMUX_PKG_HOMEPAGE=https://packages.debian.org/apt
 TERMUX_PKG_DESCRIPTION="Front-end for the dpkg package manager"
 TERMUX_PKG_DEPENDS="liblzma, libgnustl, dpkg, gnupg"
-TERMUX_PKG_VERSION=1.2.3
+TERMUX_PKG_VERSION=1.2.4
 TERMUX_PKG_SRCURL=http://ftp.debian.org/debian/pool/main/a/apt/apt_${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--host=${TERMUX_ARCH}-linux --disable-rpath acl_cv_rpath=$TERMUX_PREFIX/lib gt_cv_func_CFPreferencesCopyAppValue=no gt_cv_func_CFLocaleCopyCurrent=no ac_cv_c_bigendian=no --no-create"
 # When ready to drop bz2 support:
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_lib_bz2_BZ2_bzopen=no"
 TERMUX_PKG_FOLDERNAME=apt-${TERMUX_PKG_VERSION}
 TERMUX_PKG_ESSENTIAL=yes
+TERMUX_PKG_CONFFILES="etc/apt/sources.list"
 
 # $NDK/docs/STANDALONE-TOOLCHAIN.html: "If you use the GNU libstdc++, you will need to explicitly link with libsupc++ if you use these features"
 export LDFLAGS="$LDFLAGS -lgnustl_shared" # -lsupc++"