pypy: fix build

[licy183]

Part of #20966

[Biswa96]

There is an issue about os.setxattr in pypy. Should it be fixed here?

[licy183]

There is an issue about os.setxattr in pypy. Should it be fixed here?

It have been fixed in this PR.

Emmm... It is related to pypy3 rather than pypy. I'll fix it in next PR.

--- a/rpython/rlib/rposix.py
+++ b/rpython/rlib/rposix.py
@@ -3086,7 +3086,7 @@
 # ____________________________________________________________
 # Support for *xattr functions

-if sys.platform.startswith('linux'):
+if False:

     class CConfig:
         _compilation_info_ = ExternalCompilationInfo(