genbindings doesn't work with clang-19

[arnetheduck]

Just tried the bindings generator on a more recent distro than bookworm, where clang 19 is available - the json output has changed and the way constructor types are specified has changed as well:

			{
				"id": "0x564dc729da10",
				"inner": [
					{
						"id": "0x564dc729d8f0",
						"kind": "ParmVarDecl",
						"loc": {
							"col": 26,
							"offset": 13690,
							"tokLen": 4
						},
						"name": "type",
						"range": {
							"begin": {
								"col": 21,
								"offset": 13685,
								"tokLen": 4
							},
							"end": {
								"col": 26,
								"offset": 13690,
								"tokLen": 4
							}
						},
						"type": {
							"desugaredQualType": "QEvent::Type",
							"qualType": "Type"
						}
					}
				],
				"kind": "CXXConstructorDecl",
				"loc": {
					"col": 14,
					"line": 297,
					"offset": 13678,
					"tokLen": 6
				},
				"mangledName": "_ZN6QEventC1ENS_4TypeE",
				"name": "QEvent",
				"range": {
					"begin": {
						"col": 5,
						"offset": 13669,
						"tokLen": 8
					},
					"end": {
						"col": 30,
						"offset": 13694,
						"tokLen": 1
					}
				},
				"type": {
					"qualType": "void (Type)"
				}
			},

This is the QEvent constructor taking a QEvent::Type - in clang-14, the constructor type is void (QEvent::Type) while in clang-19 it's void (Type) - the consequence is that Type is no longer found as an "enum" leading to lots of downstream problems.

To support clang-19, one would have to dig into inner and fetch the type from desugaredQualType instead of parsing the prototype - opening this issue mostly to document the problem, even if this is not a supported way of running the generator today.