feat(demangle): Import libswift demangle 6.0.3

[Dav1dde]

Fixes: #884, #873

• Updates vendored swift sources to 6.0.3 (latest release as of today).
• Adds a new necessary include dir to the update script
• Updates the included patch
• Updates the build script. Now requires C++17, disables changes-meaning warning which causes compilation failures on recent GCCs (fine on clang). Demangle entrypoint is now guarded by SWIFT_STDLIB_HAS_TYPE_PRINTING.

This did need some manual patch-up of the NodePrinter.cpp which uses endswith instead of ends_with. I suspect this is because the llvm sources checked out are newer than 6.0.3 was intended to be built with, at that point endswith was still available (but deprecated).

I manually had to add the InvertibleProtocols.def header file, the update script did not automatically discover it. On a quick glance I couldn't see why not, this is something to look into in a follow-up or just keep it as a manual step.

One of the test cases now has a different demangling, all the others still pass, I updated it:

// Swift 5.5.1
-        "$s10Speediness17NetworkQualityCLIO3run10sequentialAC6ResultVSb_tYaKFZTf4nd_nTQ0_" => "(1) await resume partial function for specialized static NetworkQualityCLI.run",
+        "$s10Speediness17NetworkQualityCLIO3run10sequentialAC6ResultVSb_tYaKFZTf4nd_nTQ0_" => "specialized static NetworkQualityCLI.run",

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