import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

security/nss/lib/zlib/zlib.gyp

@@ -0,0 +1,49 @@
+# 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"
+  ],
+  'variables': {
+    'module': 'nss',
+  },
+  'conditions': [
+    ['use_system_zlib==1', {
+      'targets': [{
+        'target_name': 'nss_zlib',
+        'type': 'none',
+        'link_settings': {
+          'libraries': ['<@(zlib_libs)'],
+        },
+      }],
+    }, {
+      'targets': [{
+        'target_name': 'nss_zlib',
+        'type': 'static_library',
+        'sources': [
+          'adler32.c',
+          'compress.c',
+          'crc32.c',
+          'deflate.c',
+          'gzclose.c',
+          'gzlib.c',
+          'gzread.c',
+          'gzwrite.c',
+          'infback.c',
+          'inffast.c',
+          'inflate.c',
+          'inftrees.c',
+          'trees.c',
+          'uncompr.c',
+          'zutil.c',
+        ],
+        'defines': [
+          # Define verbose as -1 to turn off all zlib trace messages in
+          # debug builds.
+          'verbose=-1',
+        ],
+      }],
+    }]
+  ],
+}