fix(ios): Use install_modules_dependencies in the podspec (#796)

Author: cipolleschi

react-native-pager-view.podspec

@@ -16,21 +16,27 @@ Pod::Spec.new do |s|
 
   s.source_files = "ios/**/*.{h,m,mm}"
 
-  s.dependency "React-Core"
+  # install_modules_dependencies has been defined in RN 0.70
+  # This check ensure that the library can work on older versions of RN
+  if defined?(install_modules_dependencies)
+    install_modules_dependencies(s)
+  else
+    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    = {
+    # 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 "RCT-Folly"
-    s.dependency "RCTRequired"
-    s.dependency "RCTTypeSafety"
-    s.dependency "ReactCommon/turbomodule/core"
-    s.dependency "React-RCTFabric"
+      }
+      s.dependency "React-Codegen"
+      s.dependency "RCT-Folly"
+      s.dependency "RCTRequired"
+      s.dependency "RCTTypeSafety"
+      s.dependency "ReactCommon/turbomodule/core"
+      s.dependency "React-RCTFabric"
+    end
   end
 end