pythongh-84683: Check <prefix>/share/zoneinfo for zoneinfo files on Windows (pythonGH-28495)

Author: isuruf

Lib/sysconfig/__init__.py

@@ -412,7 +412,13 @@ def _init_non_posix(vars):
     vars['EXE'] = '.exe'
     vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT
     vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable))
-    vars['TZPATH'] = ''
+    # No standard path exists on Windows for this, but we'll check
+    # whether someone is imitating a POSIX-like layout
+    check_tzpath = os.path.join(vars['prefix'], 'share', 'zoneinfo')
+    if os.path.exists(check_tzpath):
+        vars['TZPATH'] = check_tzpath
+    else:
+        vars['TZPATH'] = ''
 
 #
 # public APIs

Misc/NEWS.d/next/Library/2021-09-21-17-17-29.gh-issue-84683.wDSRsG.rst

@@ -0,0 +1 @@
+:mod:`zoneinfo`: Check in ``<prefix>/share/zoneinfo`` for data files on Windows