Revert "Remove 's.static_framework = true' requirement for podspec (#25816)"

This reverts commit ca9e108110.

Libraries/WebSocket/React-RCTWebSocket.podspec

@@ -0,0 +1,36 @@
+# coding: utf-8
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+require "json"
+
+package = JSON.parse(File.read(File.join(__dir__, "..", "..", "package.json")))
+version = package['version']
+
+source = { :git => 'https://github.com/facebook/react-native.git' }
+if version == '1000.0.0'
+  # This is an unpublished version, use the latest commit hash of the react-native repo, which we’re presumably in.
+  source[:commit] = `git rev-parse HEAD`.strip
+else
+  source[:tag] = "v#{version}"
+end
+
+Pod::Spec.new do |s|
+  s.name                   = "React-RCTWebSocket"
+  s.version                = version
+  s.summary                = "A library for supporting WebSockets, a protocol which provides full-duplex communication channels over a single TCP connection." 
+  s.homepage               = "http://facebook.github.io/react-native/"
+  s.documentation_url      = "https://facebook.github.io/react-native/docs/network#websocket-support"
+  s.license                = package["license"]
+  s.author                 = "Facebook, Inc. and its affiliates"
+  s.platforms              = { :ios => "9.0", :tvos => "9.2" }
+  s.source                 = source
+  s.source_files           = "*.{m}"
+  s.preserve_paths         = "package.json", "LICENSE", "LICENSE-docs"
+  s.header_dir             = "RCTWebSocket"
+  s.static_framework       = true
+
+  s.dependency "React-Core/RCTWebSocketHeaders", version
+end