import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

security/nss/lib/dev/dev.gyp

@@ -0,0 +1,26 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+{
+  'includes': [
+    '../../coreconf/config.gypi'
+  ],
+  'targets': [
+    {
+      'target_name': 'nssdev',
+      'type': 'static_library',
+      'sources': [
+        'ckhelper.c',
+        'devslot.c',
+        'devtoken.c',
+        'devutil.c'
+      ],
+      'dependencies': [
+        '<(DEPTH)/exports.gyp:nss_exports'
+      ]
+    }
+  ],
+  'variables': {
+    'module': 'nss'
+  }
+}