Fix handling of CUPS url

Without the fix cups version was not detected.

Occurs in Cloudooo.

nxdbom/__init__.py

@@ -294,6 +294,8 @@ def namever(url, failonerr=True): # -> (name, ver)  | None if !failonerr
             s = removesuffix(s, tail)
         for tail in ['-py2.7'] + ['-py3.%d' % _ for _ in range(20)]:
             s = removesuffix(s, tail)
+        for tail in ('-source',):
+            s = removesuffix(s, tail)
         return s
     url = del_tgztail(url)
 

nxdbom/nxdbom_test.py

@@ -41,6 +41,7 @@ from os.path import dirname, exists
     ('https://osdn.net/frs/redir.php?f=tsukurimashou%2F56948%2Focr-0.2.zip',   'ocr',       '0.2'),
     ('http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz', 'GeoLite2-Country', None),
     ('http://downloadarchive.documentfoundation.org/libreoffice/old/5.2.4.2/rpm/x86_64/LibreOffice_5.2.4.2_Linux_x86-64_rpm.tar.gz',  'LibreOffice', '5.2.4.2'),
+    ('http://www.cups.org/software/1.7.4/cups-1.7.4-source.tar.bz2',  'cups', '1.7.4'),
 ])
 def test_namever(url, nameok, verok):
     assert nxdbom.namever(url) == (nameok, verok)