[gcc r13-2991] testsuite: Windows paths use \ and not /

[Torbjorn Svensson]

https://gcc.gnu.org/g:fe8264bb9bb1d989c54e55c7a267c2922aa489d9

commit r13-2991-gfe8264bb9bb1d989c54e55c7a267c2922aa489d9
Author: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
Date:   Fri Sep 30 16:33:24 2022 +0200

    testsuite: Windows paths use \ and not /
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/bind/ref_neg.cc: Prune Windows paths too.
    
    Co-Authored-By: Yvan ROUX  <yvan.roux@foss.st.com>
    Signed-off-by: Torbjörn SVENSSON  <torbjorn.svensson@foss.st.com>

Diff:
---
 libstdc++-v3/testsuite/20_util/bind/ref_neg.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc b/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
index e779d2f20bd..1e9f3e7fece 100644
--- a/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
@@ -50,7 +50,7 @@ void test02()
 
 // Ignore the reasons for deduction/substitution failure in the headers.
 // Arrange for the match to work on installed trees as well as build trees.
-// { dg-prune-output "/(functional|bits/invoke.h):" }
+// { dg-prune-output "[/\\](functional|bits/invoke.h):" }
 
 int main()
 {