Remove zlib.ZLIBNG_VERSION Windows requirement (#14947)

stdlib/@tests/stubtest_allowlists/common.txt

@@ -170,6 +170,10 @@ sys.ps1  # Available in interactive mode
 sys.ps2  # Available in interactive mode
 sys.tracebacklimit  # Must be set first
 
+# This is only present if Python was built with zlib-ng.
+(zlib\.ZLIBNG_VERSION)?
+(compression\.zlib\.ZLIBNG_VERSION)?
+
 
 # ==========================================================
 # Other allowlist entries that cannot or should not be fixed

stdlib/zlib.pyi

@@ -26,8 +26,8 @@ Z_RLE: Final = 3
 Z_SYNC_FLUSH: Final = 2
 Z_TREES: Final = 6
 
-if sys.version_info >= (3, 14) and sys.platform == "win32":
-    # Available when zlib was built with zlib-ng, usually only on Windows
+if sys.version_info >= (3, 14):
+    # Available when zlib was built with zlib-ng
     ZLIBNG_VERSION: Final[str]
 
 class error(Exception): ...