Implemented curl support for web requests

libadblockplus.gyp

Index: libadblockplus.gyp
===================================================================
--- a/libadblockplus.gyp
+++ b/libadblockplus.gyp
@@ -1,9 +1,12 @@
 {
+  'variables': {
+    'have_curl': '<!(python check_curl.py)'
+  },
   'includes': ['third_party/v8/build/common.gypi',
                'shell/shell.gyp'],
   'targets': [{
     'target_name': 'libadblockplus',
     'type': '<(library)',
     'include_dirs': [
       'include',
       'third_party/v8/include'
@@ -24,16 +27,27 @@
       'src/WebRequest.cpp',
       'src/WebRequestJsObject.cpp',
       '<(INTERMEDIATE_DIR)/adblockplus.js.cc'
     ],
     'direct_dependent_settings': {
       'include_dirs': ['include']
     },
     'export_dependent_settings': ['third_party/v8/tools/gyp/v8.gyp:v8'],
+    'conditions': [
+      ['have_curl==1',
+        {
+          'defines': ['HAVE_CURL'],
+          'all_dependent_settings': {
+            'defines': ['HAVE_CURL'],
+            'libraries': ['-lcurl']
+          }
+        }
+      ]
+    ],
     'actions': [{
       'action_name': 'convert_js',
       'variables': {
         'core_library_files': [
           'lib/info.js',
           'lib/io.js',
           'lib/prefs.js',
           'lib/utils.js',