liblua: Build with -DLUA_COMPAT_UNPACK

This makes 'table.unpack' exposed as 'unpack' which is used by
e.g. man.lua in neovim.

packages/liblua/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=https://www.lua.org/
 TERMUX_PKG_DESCRIPTION="Shared library for the Lua interpreter"
 TERMUX_PKG_VERSION=5.3.4
-TERMUX_PKG_REVISION=2
+TERMUX_PKG_REVISION=3
 TERMUX_PKG_SRCURL=https://www.lua.org/ftp/lua-${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_SHA256=f681aa518233bc407e23acf0f5887c884f17436f000d453b2491a9f11a52400c
 TERMUX_PKG_EXTRA_MAKE_ARGS=linux
@@ -12,7 +12,7 @@ TERMUX_PKG_BUILD_DEPENDS="readline"
 
 termux_step_pre_configure () {
 	AR+=" rcu"
-	CFLAGS+=" -fPIC -DLUA_COMPAT_5_2"
+	CFLAGS+=" -fPIC -DLUA_COMPAT_5_2 -DLUA_COMPAT_UNPACK"
 }
 
 termux_step_post_make_install() {