Keys in property list dictionaries aren't necessarily unique. Fixes xamarin-macios#5277.

[rolfbjarne]

Fixes dotnet/macios#5277.

[jstedfast]

Thanks for tackling this, @rolfbjarne

[spouliot]

are we sure the last entry wins (e.g. if used from Xcode) ?
or is it a best guess ?
it will solve the exception but it might not produce what's expected

[jstedfast]

@spouliot in the reported case, both plist values are actually the same. But yea, I don't think we know - I think it's a best guess until we get a report where the values are different.

Since it's apparently a bug in Apple's web server, it probably won't last long.

[jstedfast]

This is an example reported on StackOverflow: https://stackoverflow.com/questions/53794998/duplicate-key-in-provisioning-profile-causes-build-failure-error-msb4018/53796567#53796567

[rolfbjarne]

@spouliot

are we sure the last entry wins

I tested it:

$ cat text.plist 
<?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>key</key>
	<string>value</string>
	<key>key</key>
	<string>second value</string>
</dict>
</plist>
$ /usr/libexec/PlistBuddy -c "Print :key" ./text.plist 
second value