Generate "current" API level.

Support for using this coming in an upcoming patch.

Test: nose2
      readelf to check the following:
      * bsd_signal unversioned before current
      * bsd_signal versioned in current
      * catclose missing before current
      * catclose present and versioned in current
Bug: None
Change-Id: I861862161426d3ec5b530e3156d3a8ae96fed468
diff --git a/cc/test_gen_stub_libs.py b/cc/test_gen_stub_libs.py
index 2c79ded..e9e7249 100755
--- a/cc/test_gen_stub_libs.py
+++ b/cc/test_gen_stub_libs.py
@@ -75,6 +75,8 @@
             ['introduced=9', 'introduced-x86=21'], 'arm', 14))
         self.assertTrue(gsl.symbol_in_api(
             ['introduced=21', 'introduced-arm=9'], 'arm', 14))
+        self.assertTrue(gsl.symbol_in_api(
+            ['future'], 'arm', gsl.FUTURE_API_LEVEL))
 
         self.assertFalse(gsl.symbol_in_api(['introduced=14'], 'arm', 9))
         self.assertFalse(gsl.symbol_in_api(['introduced-arm=14'], 'arm', 9))