ENH: warn when special files in the source archive are ignored

Author: dnicolodi

mesonpy/__init__.py

@@ -999,6 +999,9 @@ def sdist(self, directory: Path) -> pathlib.Path:
 
                     sdist.addfile(member, file)
 
+                else:
+                    warnings.warn(f'special file in the source archive ignored: {member.name}')
+
             # Add 'PKG-INFO'.
             member = tarfile.TarInfo(f'{dist_name}/PKG-INFO')
             member.uid = member.gid = 0