[gcc r12-4321] ChangeLog: Remove incorrect PR reference

[Jonathan Wakely]

https://gcc.gnu.org/g:f858239830b9c791d8bbc692378137b4a725b735

commit r12-4321-gf858239830b9c791d8bbc692378137b4a725b735
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Oct 11 09:25:07 2021 +0100

    ChangeLog: Remove incorrect PR reference

Diff:
---
 libstdc++-v3/ChangeLog | 1 -
 1 file changed, 1 deletion(-)

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 5178f6a2c04..3b625d2ab06 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -260,7 +260,6 @@
 
 2021-10-08  Jonathan Wakely  <jwakely@redhat.com>
 
-	PR libstdc++/98725
 	* src/c++11/limits.cc: Fail if __cpp_inline_variables is
 	defined.