add privacy manifest to RCT-Folly

Summary:
Changelog: [Internal]

add this to the framework's resource bundle

from the audit there were callsites to fstat variants in our forked copy of boost, so use C617.1.
callsites:
- RCT-Folly/folly/FileUtil.h
- RCT-Folly/folly/portability/SysStat.h

current problem with this method is that the required reasons are not currently be aggregated during app store review, so those need to live in the app's. but go ahead and add it here for now, i think apple will try to fix it.

Reviewed By: cipolleschi

Differential Revision: D55625114

fbshipit-source-id: fb388f474e62543828218925b0d409d4b558c3db

packages/react-native/third-party-podspecs/RCT-Folly.podspec

@@ -93,6 +93,8 @@ Pod::Spec.new do |spec|
 
   spec.default_subspec = 'Default'
 
+  spec.resource_bundles = {'RCT-Folly_privacy' => 'RCT-Folly/PrivacyInfo.xcprivacy'}
+
   spec.subspec 'Default' do
     # no-op
   end

packages/react-native/third-party-podspecs/RCT-Folly/PrivacyInfo.xcprivacy

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSPrivacyAccessedAPITypes</key>
+	<array>
+		<dict>
+			<key>NSPrivacyAccessedAPIType</key>
+			<string>NSPrivacyAccessedAPICategoryFileTimestamp</string>
+			<key>NSPrivacyAccessedAPITypeReasons</key>
+			<array>
+				<string>C617.1</string>
+			</array>
+		</dict>
+	</array>
+	<key>NSPrivacyCollectedDataTypes</key>
+	<array/>
+	<key>NSPrivacyTracking</key>
+	<false/>
+</dict>
+</plist>