Use plain http connections to wrapdb when ssl is not working (i.e. on OSX).

wrap.py

@@ -17,7 +17,7 @@ import urllib.request, os, hashlib, shutil
 import subprocess
 import sys
 
-from wraptool import build_ssl_context
+import wraptool
 
 class PackageDefinition:
     def __init__(self, fname):
@@ -94,7 +94,7 @@ class Resolver:
     def get_data(self, url):
         blocksize = 10*1024
         if url.startswith('https://wrapdb.mesonbuild.com'):
-            resp = urllib.request.urlopen(url, context=build_ssl_context())
+            resp = wraptool.open_wrapdburl(url)
         else:
             resp = urllib.request.urlopen(url)
         dlsize = int(resp.info()['Content-Length'])

wraptool.py

@@ -112,6 +112,10 @@ def open_wrapdburl(urlstring):
             print('Warning: ssl not available, traffic not authenticated.',
                   file=sys.stderr)
             ssl_warning_printed = True
+        # Trying to open SSL connection to wrapdb fails because the
+        # certificate is not known. Use plain http. For some
+        # reason OSX fails here again.
+        urlstring = 'http' + urlstring[5:]
         return urllib.request.urlopen(urlstring)
 
 def get_result(urlstring):