zsh: Update from 5.0.8 to 5.1

packages/zsh/build.sh

@@ -1,8 +1,7 @@
 TERMUX_PKG_HOMEPAGE="http://www.zsh.org/"
 TERMUX_PKG_DESCRIPTION="Shell designed for interactive use, although it is also a powerful scripting language"
-TERMUX_PKG_VERSION=5.0.8
-TERMUX_PKG_BUILD_REVISION=5
-TERMUX_PKG_SRCURL="http://downloads.sourceforge.net/project/zsh/zsh/${TERMUX_PKG_VERSION}/zsh-${TERMUX_PKG_VERSION}.tar.bz2"
+TERMUX_PKG_VERSION=5.1
+TERMUX_PKG_SRCURL=http://www.zsh.org/pub/zsh-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_RM_AFTER_INSTALL="bin/zsh-${TERMUX_PKG_VERSION}"
 TERMUX_PKG_DEPENDS="libandroid-support, ncurses, termux-tools, command-not-found"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--enable-etcdir=$TERMUX_PREFIX/etc --disable-gdbm --disable-pcre ac_cv_header_utmp_h=no"