[3.12] gh-126525: Fix makeunicodedata.py output on macOS and Windows (GH-126526) (#126726)

gh-126525: Fix `makeunicodedata.py` output on macOS and Windows (GH-126526)
(cherry picked from commit f223efb)

Co-authored-by: sobolevn <[email protected]>

Author: miss-islington

Tools/unicode/makeunicodedata.py

@@ -35,7 +35,7 @@
 from textwrap import dedent
 from typing import Iterator, List, Optional, Set, Tuple
 
-SCRIPT = sys.argv[0]
+SCRIPT = os.path.normpath(sys.argv[0])
 VERSION = "3.3"
 
 # The Unicode Database