pythongh-126525: Fix makeunicodedata.py output on macOS and Windows (…

…pythonGH-126526)

(cherry picked from commit f223efb)

Co-authored-by: sobolevn <mail@sobolevn.me>

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