update all scripts

scripts/zlib.sh

@@ -6,12 +6,19 @@
 
 zlib() {
     pkgname=zlib
-    pkgver=1.3.1
-    srcurl=https://www.zlib.net/zlib-1.3.1.tar.gz
+    pkgver=1.3.2
+    srcurl=https://www.zlib.net/${pkgname}-${pkgver}.tar.gz
     print_info "** Building and installing ${pkgname}"
     [ -d $build/${pkgname} ] && return 0
-    mkdir $build/${pkgname}
+    mkdir -p $build/${pkgname}
     cd $build/${pkgname}
+    if [ ! -f $root/downloads/${pkgname}-${pkgver}.tar.gz ]; then
+        print_info "** Downloading $srcurl"
+        cd $root/downloads
+        wget $srcurl
+        check $? "download $srcurl"
+        cd -
+    fi
     tar -xf $root/downloads/${pkgname}-${pkgver}.tar.gz
     check $? "Extract ${pkgname}"
     cd ${pkgname}-${pkgver}