cmake scripts: fix conversion of qmldir files

I broke the depends in 3a103b3608 wrongly
assuming it was dead code. Bring it back and actually fix the type to be
a list of tuples.

Change-Id: I96f04843ff2e2293969b5ba0efe02fb51dc88404
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

util/cmake/pro2cmake.py

@@ -438,7 +438,7 @@ class QmlDir:
         self.imports: List[str] = []
         self.type_names: Dict[str, QmlDirFileInfo] = {}
         self.type_infos: List[str] = []
-        self.depends: List[str] = []
+        self.depends: List[Tuple[str, str]] = []
         self.designer_supported = False
 
     def __str__(self) -> str:
@@ -518,6 +518,8 @@ class QmlDir:
                 self.classname = entries[1]
             elif entries[0] == "typeinfo":
                 self.type_infos.append(entries[1])
+            elif entries[0] == "depends":
+                self.depends.append((entries[1], entries[2]))
             elif entries[0] == "designersupported":
                 self.designer_supported = True
             elif entries[0] == "import":