Build and link microhttpd from gyp

gyp/microhttpd.gyp

Index: gyp/microhttpd.gyp
diff --git a/gyp/microhttpd.gyp b/gyp/microhttpd.gyp
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+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+# A simple gyp file to generate microhttpd for internal purposes
+# most of the work(configure and make) is performed in a python script
+{
+  'targets': [
+    {
+      'target_name': 'microhttpd',
+      'type': 'static_library',
+      'variables': {
+        'base_dir%': '../third_party/libmicrohttpd',
+        'src_dir%': '../third_party/externals/microhttpd',
+      },
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '<(src_dir)/src/include',
+        ],
+        # for reasons I can't quite fathom, we need the below line to trigger
+        # a link
+        'libraries': [
+          'libmicrohttpd.a',
+        ],
+      },
+      'actions': [
+        {
+          'action_name': 'configure_and_build',
+          'inputs': [
+            '<(PRODUCT_DIR)/',
+          ],
+          'outputs': [ '<(PRODUCT_DIR)/libmicrohttpd.a' ],
+          'action': [
+            'python',
+            '<(base_dir)/build.py', 
+            '--src', '<(src_dir)',
+            '--dst', '<(PRODUCT_DIR)',
+          ],
+        },
+      ],
+    },
+  ],
+}