加入5套spine官方运行时

DateToSpine/third_party/spine-runtimes/4.2/SpineShadersStructs.podspec

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+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint spine_flutter.podspec` to validate before publishing.
+#
+Pod::Spec.new do |s|
+  s.name                = 'SpineShadersStructs'
+  s.version             = '4.2.0'
+  s.summary             = 'Metal shaders structs for spine'
+  s.description         = <<-DESC
+Metal shaders structs for spine.
+                       DESC
+  s.homepage            = 'https://esotericsoftware.com'
+  s.author              = { "Esoteric Software LLC  " => "https://esotericsoftware.com" }
+  s.license             = { :file => 'LICENSE' }
+  s.platform            = :ios, '13.0'
+
+  s.source              = { :git => 'https://github.com/esotericsoftware/spine-runtimes.git', :branch => '4.2' }
+  s.source_files        = 'spine-ios/Sources/SpineShadersStructs/*.{h,cpp}'
+
+  s.pod_target_xcconfig = {
+    'CLANG_CXX_LANGUAGE_STANDARD' => 'c++11',
+    'CLANG_CXX_LIBRARY' => 'libc++'
+  }
+end