apple: Fix zip command to preserve symlinks (#19)

Need to preserve symlinks so that the framework works correctly when used from
macOS (which requires Versions/Current as a symlink to Versions/A).

Ref: https://developer.apple.com/documentation/bundleresources/placing_content_in_a_bundle#3875936

Author: roop

apple/build-xcframework.sh

@@ -26,7 +26,7 @@ rm -rf ./connlib-macosx.xcarchive
 
 echo "Computing checksum"
 touch Package.swift
-zip -r Connlib.xcframework.zip Connlib.xcframework
+zip -r -y Connlib.xcframework.zip Connlib.xcframework
 swift package compute-checksum Connlib.xcframework.zip > Connlib.xcframework.zip.checksum.txt
 
 rm Package.swift