Consider avoiding FTP links?

[dae]

When building a local copy for #95, I ran into timeouts when downloading some of the dependencies. This turned out to be caused by the machine's firewall not allowing the incoming FTP connections.

The machines the dependencies are hosted on also appear to offer https, so I was able to get things going by changing the links:

diff --git a/pythonbuild/downloads.py b/pythonbuild/downloads.py
index 2071a35..e4c8830 100644
--- a/pythonbuild/downloads.py
+++ b/pythonbuild/downloads.py
@@ -102,13 +102,13 @@ DOWNLOADS = {
         "version": "6.1.2",
     },
     "inputproto": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/inputproto-2.3.2.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/inputproto-2.3.2.tar.gz",
         "size": 244334,
         "sha256": "10eaadd531f38f7c92ab59ef0708ca195caf3164a75c4ed99f0c04f2913f6ef3",
         "version": "2.3.2",
     },
     "isl": {
-        "url": "ftp://gcc.gnu.org/pub/gcc/infrastructure/isl-0.18.tar.bz2",
+        "url": "https://gcc.gnu.org/pub/gcc/infrastructure/isl-0.18.tar.bz2",
         "size": 1658291,
         "sha256": "6b8b0fd7f81d0a957beb3679c81bbb34ccc7568d5682844d8924424a0dadcb1b",
         "version": "0.18",
@@ -120,7 +120,7 @@ DOWNLOADS = {
         "version": "1.1.3",
     },
     "kbproto": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/kbproto-1.0.7.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/kbproto-1.0.7.tar.gz",
         "size": 325858,
         "sha256": "828cb275b91268b1a3ea950d5c0c5eb076c678fdf005d517411f89cc8c3bb416",
         "version": "1.0.7",
@@ -157,7 +157,7 @@ DOWNLOADS = {
         "license_file": "LICENSE.libffi.txt",
     },
     "libpthread-stubs": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/lib/libpthread-stubs-0.1.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/lib/libpthread-stubs-0.1.tar.gz",
         "size": 301448,
         "sha256": "f8f7ca635fa54bcaef372fd5fd9028f394992a743d73453088fcadc1dbf3a704",
         "version": "0.1",
@@ -169,7 +169,7 @@ DOWNLOADS = {
         "version": "12.0.1",
     },
     "libX11": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/lib/libX11-1.6.8.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/lib/libX11-1.6.8.tar.gz",
         "size": 3144482,
         "sha256": "69d1a27cba722dca897198a23fa8d3cad3ec0c715e00205ea4398ec68a4258a5",
         "version": "1.6.8",
@@ -349,7 +349,7 @@ DOWNLOADS = {
         "license_file": "LICENSE.libuuid.txt",
     },
     "x11-util-macros": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/util/util-macros-1.19.2.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/util/util-macros-1.19.2.tar.gz",
         "size": 103001,
         "sha256": "9225c45c3de60faf971979a55a5536f3562baa4b6f02246c23e98ac0c09a75b7",
         "version": "1.19.2",
@@ -361,25 +361,25 @@ DOWNLOADS = {
         "version": "1.13",
     },
     "xextproto": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/xextproto-7.3.0.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/xextproto-7.3.0.tar.gz",
         "size": 290814,
         "sha256": "1b1bcdf91221e78c6c33738667a57bd9aaa63d5953174ad8ed9929296741c9f5",
         "version": "7.3.0",
     },
     "xorgproto": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/xorgproto-2019.1.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/xorgproto-2019.1.tar.gz",
         "size": 1119813,
         "sha256": "38ad1d8316515785d53c5162b4b7022918e03c11d72a5bd9df0a176607f42bca",
         "version": "2019.1",
     },
     "xproto": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/xproto-7.0.31.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/proto/xproto-7.0.31.tar.gz",
         "size": 367979,
         "sha256": "6d755eaae27b45c5cc75529a12855fed5de5969b367ed05003944cf901ed43c7",
         "version": "7.0.31",
     },
     "xtrans": {
-        "url": "ftp://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/lib/xtrans-1.4.0.tar.gz",
+        "url": "https://mirror.csclub.uwaterloo.ca/x.org/pub/current/src/lib/xtrans-1.4.0.tar.gz",
         "size": 225941,
         "sha256": "48ed850ce772fef1b44ca23639b0a57e38884045ed2cbb18ab137ef33ec713f9",
         "version": "1.4.0",

Perhaps it might be worth also changing the other http links to https where possible?

[indygreg]

Yeah, there's no good reason to not use https:// here. I'll push your provided patch shortly. Thank you for suggesting the fix.