win: Fix GYP build of http_transport_test_server

The C++ http_transport_test_server was added in 439ba730c5ae and the
missing GYP build description was corrected in 0e144fb9aeff, but this
wasn’t complete for Windows. ws2_32.lib was missing.

Bug: crashpad:227
Change-Id: I2a0810468f857a02ad1a997c569eee6d9c05c7da
Reviewed-on: https://chromium-review.googlesource.com/1167210
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
diff --git a/util/util_test.gyp b/util/util_test.gyp
index ff3559e..485ed66 100644
--- a/util/util_test.gyp
+++ b/util/util_test.gyp
@@ -193,6 +193,15 @@
           'cflags!': [
             '-Wexit-time-destructors',
           ],
+          'conditions': [
+            ['OS=="win"', {
+              'link_settings': {
+                'libraries': [
+                  '-lws2_32.lib',
+                ],
+              },
+            }],
+          ],
         },
       ],
     }],