termux-tools: provide wrapper for /system/bin/umount

Good addition since we already have wrapper for /system/bin/mount.

packages/termux-tools/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=https://termux.com/
 TERMUX_PKG_DESCRIPTION="Basic system tools for Termux"
 TERMUX_PKG_LICENSE="GPL-3.0"
-TERMUX_PKG_VERSION=0.67
+TERMUX_PKG_VERSION=0.68
 TERMUX_PKG_PLATFORM_INDEPENDENT=yes
 TERMUX_PKG_ESSENTIAL=yes
 TERMUX_PKG_DEPENDS="termux-am"
@@ -12,7 +12,7 @@ termux_step_make_install() {
 	mkdir -p $TERMUX_PREFIX/bin/applets
 	# Remove LD_LIBRARY_PATH from environment to avoid conflicting
 	# with system libraries that system binaries may link against:
-	for tool in df getprop logcat mount ping ping6 ip pm settings top; do
+	for tool in df getprop logcat mount ping ping6 ip pm settings top umount; do
 		WRAPPER_FILE=$TERMUX_PREFIX/bin/$tool
 		echo '#!/bin/sh' > $WRAPPER_FILE
 		echo 'unset LD_LIBRARY_PATH LD_PRELOAD' >> $WRAPPER_FILE