Add checksums to jhbuild to make CI happy

easybuild/easyconfigs/j/jhbuild/jhbuild-3.15.92-GCCcore-4.9.3.eb

@@ -12,6 +12,7 @@ toolchain = {'name': 'GCCcore', 'version': '4.9.3'}
 
 sources = ['%(version)s.tar.gz']
 source_urls = [('https://github.com/GNOME/jhbuild/archive/')]
+checksums = [None]
 
 # jhbuild is python so it has a python dependency, but we want to give people freedom to use whatever python they
 # chose during a build process
@@ -28,7 +29,7 @@ dependencies = [
     ('flex', '2.6.0'),
     ('Bison', '3.0.4'),
     ('M4', '1.4.17'),
-    ('ConcurrentVersionsSystems', '1.11.23'),
+    ('ConcurrentVersionsSystem', '1.11.23'),
 ]
 
 # We use the simple install method as per: