scripts: Use LICENSE file in pugixml.podspec

We no longer need to specify the license boilerplate verbatim since we
have a separate file.

scripts/pugixml.podspec

@@ -3,30 +3,7 @@ Pod::Spec.new do |s|
   s.version      = "1.9"
   s.summary      = "C++ XML parser library."
   s.homepage     = "http://pugixml.org"
-  s.license      = { :type => 'MIT', :text => <<-qwertyuiop
+  s.license      = "MIT"
-The MIT License (MIT)
-
-Copyright (c) 2006-2018 Arseny Kapoulkine
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-qwertyuiop
-}
   s.author       = { "Arseny Kapoulkine" => "arseny.kapoulkine@gmail.com" }
   s.platform     = :ios, "7.0"