some disabled packages can be removed

* elixir: https://github.com/termux/unstable-packages/tree/master/packages/elixir
 * libgeos: https://github.com/termux/science-packages/tree/master/packages/libgeos
 * nethack: https://github.com/termux/game-packages/tree/master/packages/nethack

disabled-packages/elixir/build.sh

@@ -1,7 +0,0 @@
-TERMUX_PKG_HOMEPAGE=http://elixir-lang.org/
-TERMUX_PKG_DESCRIPTION="Dynamic and functional language leveraging the Erlang VM"
-TERMUX_PKG_VERSION=1.3.4
-TERMUX_PKG_SRCURL=https://github.com/elixir-lang/elixir/archive/v${TERMUX_PKG_VERSION}.tar.gz
-TERMUX_PKG_DEPENDS="erlang"
-# TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--with-ssl=openssl --disable-iri"
-TERMUX_PKG_BUILD_IN_SRC=true

disabled-packages/libgeos/build.sh

@@ -1,10 +0,0 @@
-TERMUX_PKG_HOMEPAGE=https://trac.osgeo.org/geos
-TERMUX_PKG_DESCRIPTION="GEOS - Geometry Engine"
-GEOS_SNAPSHOT=20180414
-TERMUX_PKG_VERSION=3.6.2.$GEOS_SNAPSHOT
-TERMUX_PKG_SHA256=c328bc960cda60606d722291eb2e2ae0a85a8e062f2a43f3ffbe275c0108c1a0
-TERMUX_PKG_SRCURL=https://geos.osgeo.org/snapshots/geos-$GEOS_SNAPSHOT.tar.bz2
-TERMUX_PKG_DEPENDS="python"
-TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--enable-python --with-gnu-ld "
-
-

disabled-packages/nethack/build.sh

@@ -1,14 +0,0 @@
-TERMUX_PKG_HOMEPAGE=http://www.nethack.org/
-TERMUX_PKG_DESCRIPTION="Dungeon crawl game"
-TERMUX_PKG_VERSION=3.6.0
-TERMUX_PKG_SRCURL=https://s3.amazonaws.com/altorg/nethack/nethack-360-src.tgz
-TERMUX_PKG_BUILD_IN_SRC=true
-TERMUX_PKG_DEPENDS="ncurses"
-
-termux_step_make_install() {
-	cd $TERMUX_PKG_SRCDIR/sys/unix
-	sh setup.sh hints/linux
-
-	cd $TERMUX_PKG_SRCDIR
-	make install
-}

disabled-packages/nethack/sys-unix-hints-linux.patch

@@ -1,25 +0,0 @@
-diff -u -r ../nethack-3.6.0/sys/unix/hints/linux ./sys/unix/hints/linux
---- ../nethack-3.6.0/sys/unix/hints/linux	2015-11-16 07:47:05.000000000 -0500
-+++ ./sys/unix/hints/linux	2016-05-21 20:41:10.277016227 -0400
-@@ -10,9 +10,9 @@
- 
- 
- #PREFIX=/usr
--PREFIX=$(wildcard ~)/nh/install
--HACKDIR=$(PREFIX)/games/lib/$(GAME)dir
--SHELLDIR = $(PREFIX)/games
-+PREFIX=@TERMUX_PREFIX@
-+HACKDIR=$(PREFIX)/share/$(GAME)
-+#SHELLDIR = $(PREFIX)/games
- INSTDIR=$(HACKDIR)
- VARDIR = $(HACKDIR)
- 
-@@ -21,7 +21,7 @@
- POSTINSTALL=cp -n sys/unix/sysconf $(INSTDIR)/sysconf; $(CHOWN) $(GAMEUID) $(INSTDIR)/sysconf; $(CHGRP) $(GAMEGRP) $(INSTDIR)/sysconf; chmod $(VARFILEPERM) $(INSTDIR)/sysconf;
- 
- CFLAGS=-g -O -I../include -DNOTPARMDECL $(CFLAGS1) -DDLB
--CFLAGS1=-DCOMPRESS=\"/bin/gzip\" -DCOMPRESS_EXTENSION=\".gz\"
-+CFLAGS1=-DCOMPRESS=\"@TERMUX_PREFIX@/bin/applets/gzip\" -DCOMPRESS_EXTENSION=\".gz\"
- CFLAGS+=-DSYSCF -DSYSCF_FILE=\"$(HACKDIR)/sysconf\" -DSECURE
- CFLAGS+=-DHACKDIR=\"$(HACKDIR)\"
-