Update react-native-airship.podspec (urbanairship#544)

Author: WoLewicki

react-native-airship.podspec

@@ -16,22 +16,10 @@ Pod::Spec.new do |s|
 
   s.source_files = "ios/**/*.{h,m,mm,swift}"
 
-  s.dependency "React-Core"
-
-  # Don't install the dependencies when we run `pod install` in the old architecture.
-  if ENV['RCT_NEW_ARCH_ENABLED'] == '1' then
-    s.compiler_flags = folly_compiler_flags + " -DRCT_NEW_ARCH_ENABLED=1"
-    s.pod_target_xcconfig    = {
-        "HEADER_SEARCH_PATHS" => "\"$(PODS_ROOT)/boost\"",
-        "OTHER_CPLUSPLUSFLAGS" => "-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1",
-        "CLANG_CXX_LANGUAGE_STANDARD" => "c++17"
-    }
-    s.dependency "React-Codegen"
-    s.dependency "React-RCTFabric"
-    s.dependency "RCT-Folly"
-    s.dependency "RCTRequired"
-    s.dependency "RCTTypeSafety"
-    s.dependency "ReactCommon/turbomodule/core"
+  if defined?(install_modules_dependencies()) != nil
+    install_modules_dependencies(s)
+  else
+    s.dependency "React-Core"
   end