network/luakit: Replaced backtick cmdsub.

Signed-off-by: B. Watson <urchlay@slackware.uk>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

network/luakit/luakit.SlackBuild

@@ -80,7 +80,7 @@ sed -e 's#(PREFIX)/lib/luakit#(LIBDIR)#g' -i Makefile
 sed -e "/^Exec=/ s/lua/env Malloc=1 lua/" -i extras/luakit.desktop
 patch -p1 < $CWD/gtk.patch
 
-_CFLAGS=`grep CFLAGS config.mk | sed -e "s/CFLAGS\s*+=//g" | tr "\n" " "`
+_CFLAGS=$( grep CFLAGS config.mk | sed -e "s/CFLAGS\s*+=//g" | tr "\n" " " )
 make install \
   CFLAGS="$_CFLAGS $SLKCFLAGS" \
   PREFIX=/usr \