[3.14] pythonGH-131296: Fix clang-cl warning on Windows in socketmodule.h (pythonGH-131832) (pythonGH-146340)

(cherry picked from commit 59e2330)

Co-authored-by: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>

Author: miss-islington

Modules/socketmodule.h

@@ -18,6 +18,10 @@
  */
 #ifdef AF_BTH
 # include <ws2bth.h>
+# ifdef __clang__
+#  pragma clang diagnostic push
+#  pragma clang diagnostic ignored "-Wpragma-pack"
+# endif
 # include <pshpack1.h>
 
 /*
@@ -51,7 +55,10 @@ struct SOCKADDR_BTH_REDEF {
 
 };
 # include <poppack.h>
-#endif
+# ifdef __clang__
+#  pragma clang diagnostic pop
+# endif
+#endif /* AF_BTH */
 
 /* Windows 'supports' CMSG_LEN, but does not follow the POSIX standard
  * interface at all, so there is no point including the code that