https mandatory to access central

nbbuild/antsrc/org/netbeans/nbbuild/extlibs/DownloadBinaries.java

diff --git a/nbbuild/antsrc/org/netbeans/nbbuild/extlibs/DownloadBinaries.java b/nbbuild/antsrc/org/netbeans/nbbuild/extlibs/DownloadBinaries.java
index ae33e1c2..5fbbc94 100644
--- a/nbbuild/antsrc/org/netbeans/nbbuild/extlibs/DownloadBinaries.java
+++ b/nbbuild/antsrc/org/netbeans/nbbuild/extlibs/DownloadBinaries.java
@@ -163,7 +163,7 @@
         if (local.exists()) {
             url = local.toURI().toString();
         } else {
-            url = "http://central.maven.org/maven2/" + cacheName;
+            url = "https://repo1.maven.org/maven2/" + cacheName;
         }
         URL u = new URL(url);
         return downloadFromServer(u);