Update zlib source path

Change-Id: I5bef6a617a24a21929ae85c5ee78fbaed679abb1
diff --git a/external/fetch_sources.py b/external/fetch_sources.py
index 95fac0c..6091177 100644
--- a/external/fetch_sources.py
+++ b/external/fetch_sources.py
@@ -211,7 +211,7 @@
 
 PACKAGES = [
 	SourcePackage(
-		"http://zlib.net/zlib-1.2.11.tar.gz",
+		"https://zlib.net/fossils/zlib-1.2.11.tar.gz",
 		"zlib-1.2.11.tar.gz",
 		"c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
 		"zlib"),