Add Privacy Manifest for App Store submissions

Doc: https://developer.apple.com/documentation/bundleresources/privacy_manifest_files/describing_use_of_required_reason_api
From the API list, the libevent library only uses:
- mach_absolute_time, but that one is avoided with HAVE_POSIX_MONOTONIC (default) instead of HAVE_MACH_MONOTONIC
- fstat and stat in evbuffer_file_segment_new, which is covered by third-party SDK usage (0A2A.1)
- fstat and stat in evutil_read_file_, which is used to read the "/etc/resolv.conf" and "/etc/hosts" files, for which there are no available supporting reasons

Makefile.am

@@ -101,8 +101,9 @@ LIBEVENT_PKGCONFIG=libevent.pc libevent_core.pc libevent_extra.pc
 # included from other files.
 PLATFORM_DEPENDENT_SRC = \
 	arc4random.c \
-	epoll_sub.c \
 	bufferevent_ssl.c \
+	epoll_sub.c \
+	PrivacyInfo.xcprivacy \
 	test/regress_ssl.c
 
 CMAKE_FILES = \

PrivacyInfo.xcprivacy

@@ -0,0 +1,23 @@
+<?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>NSPrivacyTracking</key>
+	<false/>
+	<key>NSPrivacyCollectedDataTypes</key>
+	<array/>
+	<key>NSPrivacyTrackingDomains</key>
+	<array/>
+	<key>NSPrivacyAccessedAPITypes</key>
+	<array>
+		<dict>
+			<key>NSPrivacyAccessedAPIType</key>
+			<string>NSPrivacyAccessedAPICategoryFileTimestamp</string>
+			<key>NSPrivacyAccessedAPITypeReasons</key>
+			<array>
+				<string>0A2A.1</string>
+			</array>
+		</dict>
+	</array>
+</dict>
+</plist>