Don't bother unpacking sqlite if we're not using it

binding.gyp

@@ -20,6 +20,8 @@
     {
       'target_name': 'action_before_build',
       'type': 'none',
+      'conditions': [
+        ['sqlite == "internal"', {
           'actions': [
             {
               'action_name': 'unpack_sqlite_dep',
@@ -32,6 +34,8 @@
               'action': ['<@(bin_name)','./node_modules/.bin/targz','deps/sqlite-autoconf-<@(sqlite_version).tar.gz','-x','deps/']
             }
           ]
+        }]
+      ]
     },
     {
       'target_name': 'node_sqlite3',