added duf and nginx and some refactor

scripts/zlib.sh

@@ -8,6 +8,7 @@ zlib() {
     pkgname=zlib
     pkgver=1.3.1
     printf "$GREEN** Building and installing ${pkgname}\n$RESET"
+    [ -d $build/${pkgname} ] && return 0
     mkdir $build/${pkgname}
     cd $build/${pkgname}
     tar -xvf $root/downloads/${pkgname}-${pkgver}.tar.gz
@@ -18,10 +19,5 @@ zlib() {
     make $makeflags
     check $? "Build ${pkgname}"
     make DESTDIR=$rootfspath install
-    # rm -rv $rootfspath/usr/include $rootfspath/usr/share/man $rootfspath/usr/lib/{pkgconfig,libz.a}
-    # ${CROSS_COMPILE}-strip --strip-unneeded $rootfspath/usr/lib/libz.so.${pkgver}
     check $? "Installing to rootfs ${pkgname}"
-    # rm -rvf $rootfspath/usr/lib/pkgconfig
-    # find $rootfspath -type f -name "*.a" -delete
-    # find $rootfspath -type f -name "*.la" -delete
 }