Change tools/utils/sourceList.py to always output posix paths.

Fixes the script so that it always outputs paths with forward
slashes even on Windows when using a Windows native Python build
instead of the msys2/cygwin one. Forward slash paths are needed
because this is the form qmake/cmake uses internally and is what
is expected when they call this build script.

Author: acolwell

tools/utils/sourceList.py

@@ -1,7 +1,7 @@
 from xml.etree import ElementTree
 import os
 import sys
-
+from pathlib import PurePath
 
 def list_typesystem_cpp_sources(typesystem, out):
     tree = ElementTree.parse(typesystem)
@@ -15,7 +15,10 @@ def list_typesystem_cpp_sources(typesystem, out):
     sources = [f"{package.lower()}_module_wrapper.cpp"]
     sources.extend([f"{typename.lower()}_wrapper.cpp" for typename in types])
 
-    return [os.path.normpath(os.path.join(out, package, f)) for f in sources]
+    # Return normalized paths that can be consumed by cmake/qmake.
+    # These paths must be in posix form (i.e. have forward slashes) since that
+    # is what cmake/qmake uses internally.
+    return [PurePath(os.path.normpath(os.path.join(out, package, f))).as_posix() for f in sources]
 
 
 if __name__ == "__main__":