gh-98940: Fix Mac/Extras.install.py File filter bug (#98943)

Slightly simplify the script and fix a case issue in the name of ``.DS_Store`` files.

Co-authored-by: Nikita Sobolev <[email protected]>

Author: zhangbo2012

Mac/Extras.install.py

@@ -9,10 +9,9 @@
 debug = 0
 
 def isclean(name):
-    if name == 'CVS': return 0
-    if name == '.cvsignore': return 0
-    if name == '.DS_store': return 0
-    if name == '.svn': return 0
+    if name in ('CVS', '.cvsignore', '.svn'):
+        return 0
+    if name.lower() == '.ds_store': return 0
     if name.endswith('~'): return 0
     if name.endswith('.BAK'): return 0
     if name.endswith('.pyc'): return 0

Misc/NEWS.d/next/macOS/2022-11-01-10-32-23.gh-issue-98940.W3YzC_.rst

@@ -0,0 +1 @@
+Fix ``Mac/Extras.install.py`` file filter bug.