Bug 1549608 - Do not sign dbm3 lib if DBM is disabled. r=jcj

Differential Revision: https://phabricator.services.mozilla.com/D30138

--HG--
extra : moz-landing-system : lando

nss.gyp

@@ -267,6 +267,10 @@
                   'inputs/': [['exclude', 'freeblpriv']],
                   'outputs/': [['exclude', 'freeblpriv']]
                 }],
+                ['disable_dbm==1', {
+                  'inputs/': [['exclude', 'nssdbm3']],
+                  'outputs/': [['exclude', 'nssdbm3']]
+                }],
               ],
               'action': ['<(python)', '<(DEPTH)/coreconf/shlibsign.py', '<@(_inputs)']
             }