[gcc r11-2460] libstdc++: Remove duplicate dg-do directive

[Jonathan Wakely]

https://gcc.gnu.org/g:351f60794c116d25a78da5220f3da74b4268cb8d

commit r11-2460-g351f60794c116d25a78da5220f3da74b4268cb8d
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jul 31 17:51:00 2020 +0100

    libstdc++: Remove duplicate dg-do directive
    
    Also add an effective target to clarify it should only run for C++17 and
    later.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/time_point_cast/rounding.cc: Remove
            duplicate dg-do directive and add c++17 effective target.

Diff:
---
 libstdc++-v3/testsuite/20_util/time_point_cast/rounding.cc | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/libstdc++-v3/testsuite/20_util/time_point_cast/rounding.cc b/libstdc++-v3/testsuite/20_util/time_point_cast/rounding.cc
index 7cf4931645e..9918b83bac1 100644
--- a/libstdc++-v3/testsuite/20_util/time_point_cast/rounding.cc
+++ b/libstdc++-v3/testsuite/20_util/time_point_cast/rounding.cc
@@ -15,10 +15,8 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-do run { target c++11 } }
-
 // { dg-options "-std=gnu++17" }
-// { dg-do compile }
+// { dg-do compile { target c++17 } }
 
 #include <chrono>